Commands Overview

This page contains an extensive listing of all Logo commands, properties, global names, and math operators. Click “Start” to return to the beginning of a section, or “Top” to return to the top of this page.

Commands

.Top Start
.DEFMACRO	Defines a macro.
.MACRO	Defines a macro.
.WHO	Reports a list of objects listening to commands.
ATop Start
ABOUT	A user-defined procedure to display information about your program.
ABS	Reports the absolute value of a number.
AGET	Reports the value of an array element.
ALERT	Displays an alert box.
ALIAS	Defines alias names.
ALLTURTLES	A list of all turtles.
ALPHA	Reports the first active turtle's alpha value.
APPENDMENU	Appends a new menu.
APPENDMENUITEM	Appends a new menu item.
APPLY	Applies a parameter list to a procedure.
ARC	Draws an arc.
ARCCOS (ACOS)	Reports the arccosine.
ARCCOT (ACOT)	Reports the arccotangent.
ARCCSC (ACSC)	Reports the arccosecant.
ARCSEC (ASEC)	Reports the arcsecant.
ARCSIN (ASIN)	Reports the arcsine.
ARCTAN (ATAN)	Reports the arctangent.
ARCTAN2 (ATAN2)	Reports the polar angle heading of the motion vector (position change) deltaX deltaY.
ARRAY	Creates an array.
ARRAY? (ARRAYP)	Reports TRUE if the object is an array.
ARRAYDIMS	Reports the structure of an array.
ASET	Sets the value of an array element.
ASK	Makes objects execute a list of commands.
BTop Start
BACK (BK)	Moves a turtle backwards.
BACKGROUND (BG)	Reports the background color.
BACKTRACE (BT)	Prints the list of nested procedure calls.
BGPATTERN	Reports the background pattern.
BLUEBOT.BATTERY	Reports Blue-Bot's battery level.
BLUEBOT.CLEAR	Clears all commands stored in Blue-Bot's memory.
BLUEBOT.CLOSE	Disconnects the Blue-Bot from Logo.
BLUEBOT.GO	Executes commands stored in Blue-Bot's memory.
BLUEBOT.RUN	Executes Blue-Bot commands.
BLUEBOT.WRITE	Downloads a procedure to Blue-Bot.
BLUEBOT? (BLUEBOTP, BLUEBOT.OPEN)	Tests if the Blue-Bot is connected and ready to receive commands.
BOUNCE	Lets the turtles bounce off the graphics bounds inside the Graphics canvas.
BOUNDS	Reports the drawing bounds of the Graphics canvas.
BPCLEAR	Deletes all breakpoints.
BURIED	Outputs a structured contents list of all buried elements.
BURIED? (BURIEDP)	Outputs TRUE if the element described by its input is buried.
BURIEDNAMES	Outputs a list of all buried names.
BURIEDPROCS	Outputs a list of all buried procedures.
BURIEDPROPS	Outputs a list of all buried property lists.
BURY	Makes names and procedures invisible.
BURYALL	Makes all names and procedures invisible.
BURYNAME	Makes one or more names invisible.
BURYNAMES	Makes all names invisible.
BURYPROC	Makes one or more procedures invisible.
BURYPROCS	Makes all procedures invisible.
BURYPROP	Makes one or more property lists invisible.
BURYPROPS	Makes all property lists invisible.
BUTFIRST (BF)	Reports all but the first element of its input.
BUTLAST (BL)	Reports all but the last element of its input.
BUTMEMBER (BM)	Removes an element from its input.
BUTTON? (BUTTONP)	Reports the state of the left mouse button.
BYE (QUIT, EXIT)	Ends Logo.
CTop Start
CASE	Outputs a value based on an input value.
CATCH	Catches runtime errors and THROWn data.
CHAR	Converts a number into a Unicode character.
CHECKTYPE	Checks an value for a type.
CLEAN	Erases the graphics canvas.
CLEARSCREEN (CS)	Erases the graphics panel and homes the turtle.
CLEARTEXT (CT)	Clears the Listener panel.
CLOSE	Closes a stream.
COLOR	Reports the RGB color value for a color name or color index.
COLOR	Reports the color for a name or value if possible.
COLORINDEX (BASECOLOR)	Coerces a color value to a basic Logo color number.
COLORNAME	Reports the name of a color if possible.
COLORS	Reports a list of available color names.
COMMAND	Invoke a menu command by its ID.
CONTENTS (CO)	Outputs a complete structured contents list.
CONTINUE (CO)	Ends a pause.
COPYDEF	Copies a procedure definition.
COS	Reports the cosine.
COT	Reports the cotangent.
COUNT	Counts the number of items in its input.
CPROP	Calls a property as a procedure.
CREATE	Creates a file.
CREATE.DIR (MKDIR)	Creates a folder.
CSC	Reports the cosecant.
CTURTLES	Arranges turtles in a circle.
CURDIR	Reports the current working directory.
DTop Start
DATE	Reports the date.
DECLARE (DCL)	Creates an object.
DEFINE	Defines a procedure.
DEFINED? (DEFINEDP)	Checks whether a procedure is defined.
DELETE	Deletes a file or a folder.
DELETEMENU	Deletes a menu.
DELETEMENUITEM	Deletes a menu item.
DIRECTORY (DIR)	Lists the contents of current working directory.
DISTANCE	Reports the distance between the turtle and a location.
DO.UNTIL	Runs a list until a condition is true.
DO.WHILE	Runs a list until a condition is false.
DOT	Draws a dot.
DOT? (DOTP)	Tests whether a pixel is present at the given location.
DOTCOLOR	Reports the color of a pixel.
DRAW	Clears the current graphics canvas and resets all attached turtles.
ETop Start
EACH	Applies a runlist to every object in the TELL list.
EDALL	Edits the entire Logo workspace.
EDIT	Edits parts or all of the Logo workspace.
EDN	Edits one or more Logo names.
EDNS	Edits all Logo names.
EDPL	Edits one or more Logo property lists.
EDPLIST	Edits the properties of a lrpoerty list, a widget, or a panel.
EDPLS	Edits all Logo properties.
EDPS	Edits all user-defined, unburied procedures.
EDSHAPE	Launches the shape editor.
ELSE	Starts the ELSE branch of an IF command.
EMPTY? (EMPTYP)	Checks whether a name is empty.
END	Ends a procedure definition.
EOF? (EOFP)	Outputs TRUE if the current stream is at EOF.
ERALL	Erases the entire Logo workspace.
ERASE (ER)	Erases Logo elements.
ERN	Erase one or more Logo names.
ERNS	Erases all Logo names.
ERPL	Erases one or more Logo property lists.
ERPLS	Erases all Logo properties.
ERPS	Erases all procedures.
ERROR	Outputs the last runtime error.
EVAL	Runs a list and collects all outputs.
EVERY	Outputs a list of objects.
EXPN (EXP)	Calculates the natural base e raised to a power.
FTop Start
FENCE	Fences all turtles inside the drawing bounds.
FILE? (FILEP)	Reports TRUE if a file or directory exists.
FILL	Fills an area.
FILLARRAY	Sets the values of an array.
FILLGRID	Sets the text values of a grid.
FINDMENUID	Finds the ID of a menu item.
FIRST	Reports the first element of its input.
FLATTEN	Reports a flat version of its list input.
FONT	Reports the current font of the first active turtle.
FONTS	Reports a list of all loaded and available fonts.
FOR	Runs a list for a defined number of times.
FOREACH	Runs a list for each element of its first input.
FOREVER	Runs a list forever.
FORM	Formats a number.
FORWARD (FD)	Moves a turtle forward.
FPUT	Prepends an element to its input.
FREEZEPIC	Freezes the current graphics display.
FROMMEMBER (FM)	Removes the first part of its input until a pattern is found.
FULLSCREEN (FS)	Switches to the Full Screen perspective
GTop Start
GETX (XCOR)	Reports the X coordinate of a turtle.
GETXY (POS)	Reports the coordinates of a turtle.
GETY (YCOR)	Reports the Y coordinate of a turtle.
GGET	Outputs the name of a widget stored in a grid cell.
GGETTEXT	Outputs the text of a grid cell.
GLIST	Reports the property lists that contain a property with a given name.
GO	Jumps to a label inside a procedure.
GPPROP	Alters a property of a grid, a row, a column, or a cell.
GPROP	Retrieves a property.
GRID	Sets the characteristics of the graphics grid.
GRIDDIMS	Reports the size of a grid.
GRIDOFF	Hides the grid of the Graphics panel.
GRIDON	Displays the grid of the Graphics panel.
GSET	Stores a widget into a grid cell.
GSETTEXT	Stores a text into a grid cell.
HTop Start
HALT	Stops one or all background programs.
HEADING	Reports the heading of a turtle.
HELP	Displays help for a command.
HIDETURTLE (HT)	Hides a turtle.
HIT?	Tests the first active widget against widgets listed on the hit list.
HITTABLE	Reports the contents of the hit list.
HOME	Moves the turtle back to [0 0].
HTML	Creates and outputs a HTML sequence.
ITop Start
IF	Runs instructions based on a condition.
IFFALSE (IFF)	Runs a list if TEST was false.
IFTRUE (IFT)	Runs a list if TEST was true.
IGNORE	Ignores the output of a procedure.
INT	Reports the integer part of a number.
IS.A	Checks an object for being of a specific type.
ISEQ	Outputs a list of sequential integers.
ITEM	Returns a specific element of its input.
JTop Start
JOIN	Converts a list to a word.
KTop Start
KEY	Reports the code of the last key that the user typed.
LTop Start
LABEL	Marks a target for the GO command.
LAST	Reports the last element of its input.
LAUNCH	Launches a runlist or procedure for execution in the background.
LAUNCHED	Outputs a list of all active background engines.
LED	Controls a robot's LEDs.
LEFT (LT)	Turns a turtle left.
LIST	Concatenates its inputs to a list.
LIST? (LISTP)	Checks for its input being a list.
LISTARRAY	Reports the values of an array as a list.
LISTGRID	Reports the values of a grid as a list.
LMAKE (LOCALMAKE)	Create and set a local name.
LOAD	Loads a file into Logo.
LOADPIC	Loads a picture.
LOADSHAPE	Loads a turtle shape from a data space and sets the shape of all active turtles.
LOADSNAP	Loads a bitmap.
LOCAL	Declares local variables inside a procedure.
LOCKSHAPE	Prevents a bitmap from turning.
LOG (LN)	Outputs the natural logarithm of its input.
LOG10	Outputs the logarithm of its input.
LOGAND	Combines its inputs with a boolean AND operation.
LOGNOT	Reports the bitwise logical complement of its input.
LOGOR	Combines its inputs with a boolean OR operation.
LOGXOR	Combines its inputs with a boolean XOR operation.
LOWERCASE	Converts its argument to lower case.
LPUT	Appends an element to its input.
LSH (ASHIFT)	Shifts its input with sign extension.
LSHIFT	Shifts its input without sign extension.
LTURTLES	Arranges turtles in a row.
MTop Start
MACRO? (MACROP)	Checks its input for being a macro.
MACROEXPAND	Outputs the expansion of a macro.
MAKE	Assigns a value to a name.
MEMBER? (MEMBERP)	Checks if an object is part of another object.
MIDI.RECORD	Records and saves music commands that PLAY plays.
MILLISECONDS	Outputs the number of milliseconds spent.
MINUS	Outputs the negative value of its input.
MIXEDCASE	Converts its argument to mixed case.
MODULO	Outputs the remainder of two numbers.
MOTORS	Controls a robot's motors.
MOUSE	Reports the position of the mouse cursor.
MOUSESHAPE	Reports the shape of the mouse cursor.
NTop Start
NAME	Assigns a value to a name.
NAME? (NAMEP)	Checks whether its input is assigned a value.
NAMELIST	Outputs a structured contents list with names.
NAMES	Outputs a structured contents list with all names.
NEW	Creates a new Logo object.
NOT	Negates its input.
NUMBER? (NUMBERP)	Checks its input for being a number.
OTop Start
OPACITY	Reports the opacity of the first active turtle.
OPEN	Opens a file and returns the channel number.
ORIGIN	Reports the origin of a turtle's coordinate system.
OUTPUT (OP)	Exits a procedure and outputs a value.
PTop Start
PANGLE	Reports the turtle's angle as a polar angle.
PARSE	Parses a string and outputs a list.
PATHNAME	Reports the full path name for a file name.
PATTERN	Reports the turtle's pattern.
PAUSE	Pauses a procedure.
PDIST	Reports the distance from the turtle to its home.
PEN	Reports the pen mode.
PENCOLOR (PC)	Reports the pen color.
PENDOWN (PD)	Puts the pen down.
PENDOWN? (PENDOWNP)	Checks whether the pen is down.
PENERASE (PE)	The pen draws with the background color.
PENREVERSE (PX)	The pen inverts all colors.
PENUP (PU)	The pen moves up.
PHEADING	Reports the turtle's polar heading.
PHELP	Displays help for a property.
PI	Reports the number Pi.
PICK	Randomly picks an element.
PLACE	Attempts to place the active widgets at the suggested location.
PLAY	Plays sound files or notes.
PLAY.NOTES	Plays simple songs on a robot's speaker.
PLAY.SOUND	Play a predefined sound on a robot's speaker.
PLIST	Reports the property list of a name.
PLIST? (PLISTP)	Checks its input for containing a property list.
PLISTS (PROPERTIES)	Outputs a structured contents list with all properties.
PLLIST	Outputs a structured contents list with properties.
POALL	Prints the entire Logo workspace.
PON	Prints a Logo name.
PONS	Prints all Logo names.
POPL	Prints one or more Logo property lists.
POPLS	Prints all Logo properties.
POPS	Prints all Logo procedures.
POT	Prints the title line of one or more user-defined procedures.
POTS	Prints the title line of all user-defined procedures.
PPOS	Reports the turtle's polar position.
PPROP	Stores a property.
PPROPS	Stores a list of properties.
PRIMITIVE? (PRIMITIVEP)	Checks its input for being a built-in procedure or macro.
PRIMITIVES	Outputs a structured contents list with all primitives.
PRINT (PR)	Prints text with a line feed.
PRINTLINE	Prints a list of numbers as Unicode characters.
PRINTOUT (PO)	Prints procedures, names, or properties.
PRINTQUOTE (PQ)	Prints its input and a newline.
PROBOT.CLOSE	Disconnects the Pro-Bot from Logo.
PROBOT.LIGHTS	Turns the Pro-Bot's headlights on or off.
PROBOT.READ	Uploads all Pro-Bot procedures into Logo's workspace.
PROBOT.SOUND	Plays Pro-Bot sounds.
PROBOT.WRITE	Downloads all Pro-Bot procedures to the Pro-Bot.
PROBOT? (PROBOTP, PROBOT.OPEN)	Tests if a Pro-Bot is connected and ready to receive commands.
PROCEDURE? (PROCEDUREP)	Checks its input for being a user-defined procedure.
PROCEDURES	Outputs a list with all user procedures.
PROCLIST	Outputs a structured contents list with procedures.
PROGRESSBAR	Displays a progress bar.
PSETHEADING (PSETH)	Sets the polar heading of a turtle.
QTop Start
QUOTE	Quotes its input.
RTop Start
RADARCTAN (RADATAN)	Reports the arc tangent of an angle expressed in radians.
RADCOS	Reports the cosine of an angle expressed in radians.
RADSIN	Reports the sine of an angle expressed in radians.
RANDOM	Outputs a random number.
READ	Reads one Logo word.
READCHAR (RC)	Read a character from the standard input stream.
READFILE	Reads and parses the contents of a file.
READLINE	Reads a line and outputs it as a list of numbers.
READLIST (RL)	Reads a line and outputs it as a list.
READPROMPT (RP)	Opens a dialog box and reads a line.
READQUOTE (RQ)	Reads a line.
READWORD (RW)	Reads the next word of a line.
REDO	Redoes the last drawing command after an UNDO command.
REMOVE	Removes elements from a word or a list.
REMPROP	Removes a property.
RENAME	Renames a disk file.
REPCOUNT	Reports the value of the REPEAT counter.
REPEAT	Runs a runlist repeatedly.
REPTOTAL	Reports the total number of REPEATs.
RERANDOM	Seed the random number generator.
RESTART	Erases everything and restarts Logo.
RIGHT (RT)	Turns a turtle right.
ROUND	Rounds a number.
RSEQ	Outputs a list of equally spaced rational numbers.
RUN	Runs a word or list.
STop Start
SAVE	Saves the workspace to disk.
SAVEPIC	Saves the contents of the Graphics panel.
SAVESHAPE	Saves the shape of the first active turtle.
SAVESNAP	Saves a turtle shape.
SAY	Makes Logo speak its input.
SEC	Reports the secant.
SELECT.BLUETOOTH	Selects a Bluetooth device.
SELECT.FILE	Displays a dialog to select a file.
SELECT.FOLDER	Displays a dialog to select a folder.
SELECT.VOICE	Opens a dialog where you can select a voice for the SAY command.
SENTENCE (SE)	Concatenates its inputs to a list, flattening lists.
SETALPHA	Sets the default alpha value for colors.
SETARRAYDIMS	Sets the structure of an array.
SETBG	Sets the background color.
SETBGPATTERN	Sets the background pattern.
SETBOUNDS	Set the drawing bounds of the current Graphics canvas.
SETCURDIR	Changes the current working directory.
SETFONT	Sets the turtle drawing font.
SETGRIDDIMS	Sets the size of a grid.
SETHEADING (SETH)	Sets the heading of a turtle.
SETHITTABLE	Sets the contents of the hit list.
SETMOUSESHAPE	Sets the shape of the mouse cursor.
SETOPACITY	Sets the opacity of all active turtles.
SETORIGIN	Sets the coordinate system origin of the active turtles.
SETP	Sets the turtle's polar position.
SETPATTERN	Sets the turtle pattern.
SETPC	Sets the pen color.
SETPEN	Sets the pen characteristics.
SETSHADOW	Sets the drop shadow for all active turtles.
SETSHAPE	Sets the shape of all active turtles.
SETSPEED	Sets the speed at which turtle commands are executed.
SETSTEPSIZE	Sets the step size of all active turtles and bitmaps.
SETTEXTCOLOR	Sets the text color in the Listener panel.
SETTEXTFONT	Sets the font for PRINT, TYPE and other output commands.
SETTURTLENAME (SETTNAME)	Sets the name of a turtle.
SETTURTLES (SETT)	Creates a range of turtles.
SETTURTLESIZE (SETTSIZE, SETTS)	Sets the scaling factor of a widget.
SETVELOCITY	Controls the speed of an independently moving widget.
SETWIDTH (SETW)	Sets the pen width.
SETX	Sets the X coordinate of a turtle.
SETXY (SETPOS)	Sets the coordinates of a turtle.
SETY	Sets the Y coordinate of a turtle.
SHADOW	Reports the drop shadow for the first active turtle.
SHAPE	Outputs the name of the first active turtle's shape.
SHOW	Prints text with a line feed.
SHOWN? (SHOWNP)	Reports whether a turtle is visible.
SHOWTURTLE (ST)	Makes a turtle visible.
SIN	Reports the sine.
SLOWTURTLE	Slows down the turtle to half speed.
SNAP	Moves parts of the Graphics panel into a bitmap.
SNAPSIZE	Outputs the size of a bitmap.
SPEED	Reports the speed in which turtle commands are executed.
SPLIT	Splits a word into a list using a separator.
SPLITSCREEN (SS)	Makes both the Listener panel and the Graphics canvas visible.
SQRT	Reports the square root.
STAMP	Draws a bitmap or turtle.
STAMPOVAL	Draws an oval.
STAMPRECT	Draws a rectangle.
STEP	Turns on stepping for the given elements.
STEPPED	Outputs a structured contents list of all stepped elements.
STEPSIZE	Outputs the step size of the first active turtle or bitmap.
STOP	Exits a procedure, or stops a program.
SUBDIR	Lists the contents of current working directory.
SUBST	Substitutes text in a word or a list.
TTop Start
TAN	Reports the tangent.
TELL	Defines a list of objects listening to commands.
TELLALL	Tells a range of turtle numbers.
TELLEVEN	Tells all turtles with even numbers.
TELLODD	Tells all turtles with odd numbers.
TEST	Test a condition; used with IFTRUE and IFFALSE.
TEXT	Outputs a procedure definition.
TEXTARRAY	Sets the structure of an array.
TEXTFONT	Reports the font used for output.
TEXTSCREEN (TS)	Minimizes the Graphics canvas and maximizes the Listener panel.
THEN	Starts the THEN branch of an IF command.
THING	Reports the value of a name.
THROW	Throws a Logo word or a runtime error.
TIME	Outputs the time.
TO	Defines a procedure.
TOPLEVEL	Returns to toplevel.
TOWARDS	Reports the angle of a position compared to the turtle position.
TRACE	Turns on tracing of the given elements.
TRACED	Outputs a structured contents list of all traced elements.
TUFFBOT.BATTERY	Reports Tuff-Bot's battery level.
TUFFBOT.BUTTONS	Programs Tuff-Bot's buttons.
TUFFBOT.CLEAR	Clears all commands stored in Tuff-Bot's memory.
TUFFBOT.CLOSE	Disconnects the Tuff-Bot from Logo.
TUFFBOT.GO	Executes commands stored in Tuff-Bot's memory.
TUFFBOT.OBSTACLE	Defines Tuff-Bot's obstacle-avoidance subroutine.
TUFFBOT.RUN	Executes Tuff-Bot commands.
TUFFBOT.WRITE	Downloads a procedure to Tuff-Bot.
TUFFBOT? (TUFFBOTP, TUFFBOT.OPEN)	Tests if the Tuff-Bot is connected and ready to receive commands.
TURTLENAME (TNAME)	Gets the name of the first active turtle.
TURTLENAMES (TNAMES)	Outputs a list of all turtle names.
TURTLES	Reports the number of turtles.
TURTLESIZE (TSIZE)	Reports the scaling factor of a turtle.
TURTLETEXT (TT)	Prints its input on the Graphics canvas.
TURTLETEXTBASE (TTBASE)	Outputs the baseline offset of the first listening turtle's font
TURTLETEXTSIZE (TTSIZE)	Outputs the dimensions of a text drawn with the first listening turtle.
TYPE	Prints text.
TYPEOF	Reports the type of a name.
UTop Start
UNBURY	Makes names and procedures visible.
UNBURYALL	Makes all names and procedures visible.
UNBURYNAME	Makes one or more names visible.
UNBURYNAMES	Makes all names visible.
UNBURYPROC	Makes one or more procedures visible.
UNBURYPROCS	Makes all procedures visible.
UNBURYPROP	Makes one or more property lists visible.
UNBURYPROPS	Makes all property lists visible.
UNDO	Undoes the last drawing command.
UNFREEZEPIC	Unfreezes the current graphics display.
UNICODE	Converts a character into its Unicode value.
UNLOCKSHAPE	Lets a bitmap rotate according to the turtle's heading.
UNSTEP	Turns off stepping of the given elements.
UNTIL	Runs a list until a condition is true.
UNTRACE	Turns off tracing of the given elements.
UPPERCASE	Converts its argument to upper case.
VTop Start
VELOCITY	Reports the speed of an independently moving widget.
VERINFO	Outputs Logo version information as a list.
VERSION (VER)	Outputs the Logo version.
WTop Start
WAIT	Waits for a number of milliseconds.
WEBLINK	Creates and outputs a HTML web link.
WHEN	Monitors a change to a Logo property or to a Logo event.
WHENEVER	Monitors changes to a Logo property or to a Logo event.
WHILE	Runs a list until a condition is false.
WHO	Reports a list of objects listening to commands.
WIDTH	Reports the pen width.
WINDOW	Removes the boundary for turtle movements.
WORD	Concatenates its inputs to a word.
WORD? (WORDP)	Checks its input for being a word.
WRAP	Lets the turtles wrap inside the canvas.
WRITEFILE	Stores a Logo word or list into a file.
XTop Start
XLIST	Concatenates its inputs to a parenthesized list.

Properties

ATop Start
ALIGN	Controls the alignment of a widget in a grid cell.
ALPHA	Controls the transparency of the colors the turtle uses to draw.
ANCHOR	Controls the anchoring of a widget.
APPEND	Appends one or more items to the list box.
APPNAME	Contains the name of your Logo app.
ARRAYBASE	Controls the lowest array or grid index.
AUTOSAVE	Controls the amount of data that Logo saves and restores automatically.
AUTOSCROLL	Gets or sets a vertical scroll bar.
AUTOWIDTH	Controls the auto-resizing of a widget in a grid cell.
BTop Start
BACKGROUND	Controls the background color of a control.
BATTERY	Reports the battery level of InO-Bot.
BATTERY	Reports the battery level of InO-Bot.
BGCOLOR	Controls the background color of the Graphics panel.
BGPATTERN	Sets the background pattern.
BORDER	Sets or reports the widget's border color.
BOUNDS	Reports the widget's size, depending on the scale and rotation.
BROWSER	Reports the browser name.
BUTTON	Reports the state of the mouse's buttons.
CTop Start
CALIBRATION	Controls InO-Bot's calibration factors for turns and movements.
CALIBRATION	Controls InO-Bot's calibration factors for turns and movements.
CAMERA	Controls which camera is active.
CAMERAS	Outputs a list of camera names.
CASE	Controls the conversion of input to upper case.
CELLSIZE	Controls the size of all table cells.
CLEAR	Erases the contents of the list box.
COLOR	Controls the text color of a control.
COLOR	Controls the grid's cell border color.
COLORED.TURTLES	Displays turtles with their pen color.
COLUMN	Sets or reports the widget's column number if in a grid cell.
COLUMNS	Controls the number of columns of a grid.
CONNECTOR	Controls InO-Bot's external connector.
CONNECTOR	Controls InO-Bot's external connector.
CONTROLS.FONT	Controls the font used when creating a control.
CRAWL	Sets or reports the widget's crawl speed.
DTop Start
DEBUGGER	Controls the use of the Logo debugger.
DISTANCE	Reports InO-Bot's distance to an obstacle.
DISTANCE	Reports InO-Bot's distance to an obstacle.
ETop Start
ENABLED	Enables or disables a widget.
ENVIRONMENT	Reports the device that Logo is executing upon.
FTop Start
FILE	Returns the selected file of a FILECHOOSER control.
FILTER	Gets or sets the edit field's input filter.
FIND	Finds a list box item.
FONT	Controls the Listener font.
FONT	Sets or reports the widget's font.
FRONTLEFT	Reports the status of InO-Bot's front left obstacle sensor.
FRONTLEFT	Reports the status of InO-Bot's front left obstacle sensor.
FRONTRIGHT	Reports the status of InO-Bot's front right obstacle sensor.
FRONTRIGHT	Reports the status of InO-Bot's front right obstacle sensor.
FULLSCREEN	Controls whether to have Terrapin Logo occupy the entire screen or display in normal size.
GTop Start
GLOW	Determines whether the widget's drop shadow appears as a glow effect.
HTop Start
HEADING	Controls the widget's heading.
ITop Start
INCREMENT	Controls the increment value when the slider is dragged.
INDEX	Controls the index of a selected list box item.
INFRARED	Controls InO-Bot's infrared sensor.
INFRARED	Controls InO-Bot's infrared sensor.
INSERT	Inserts one or more items into a list box.
ITEM	Outputs a list box item by index.
ITEMCOUNT	Reports the number of list box items.
ITEMS	Controls the contents of the listbox.
KTop Start
KEY	Reports the last key that the user has typed.
LTop Start
LAYOUT	Controls the position and size of a panel.
LIGHT	Reports the status of InO-Bot's light sensor.
LIGHT	Reports the status of InO-Bot's light sensor.
LIGHTS	Controls InO-Bot's headlights.
LIGHTS	Controls InO-Bot's headlights.
LIMIT	Limits the number of character that a user can enter into an edit box.
LINELEFT	Reports the status of InO-Bot's left line sensor.
LINELEFT	Reports the status of InO-Bot's left line sensor.
LINERIGHT	Reports the status of InO-Bot's right line sensor.
LINERIGHT	Reports the status of InO-Bot's right line sensor.
LINK	Gets or sets the video link of the video to display.
LISTENER.LINES	Controls the maximum number of lines in the Listener panel.
LISTENER.READONLY	Controls whether all output in the Listener panel is readonly.
LOAD	Loads an image file into the bitmap.
LOCALE	Alters Logo's language.
MTop Start
MAXIMUM	Controls the maximum value of the slider.
MINIMUM	Controls the minimum value of the slider.
MODIFIED	Reports whether the contents of an edit box have been modified.
MOUSE	Reports the position of the mouse.
NTop Start
NAME	Sets or reports the object's alias name.
NOISELEVEL	Reports InO-Bot's microphone noise level.
NOISELEVEL	Reports InO-Bot's microphone noise level.
OTop Start
OFFSET	Controls the location of the Graphic Panel's center point.
OPACITY	Controls the opacity value used for colors.
ORIGIN	Controls the origin of the widget's coordinate system.
ORIGINALNAME	Reports the widget's original name.
PTop Start
PATTERN	Reports or sets the current fill pattern.
PENCOLOR	Contains the current pen color.
PENSTATE	Controls the turtle's pen state.
PENWIDTH	Gets or sets the turtle's pen width.
PICTURE.FORMAT	Controls the file extension used for images if none was supplied.
PLACEHOLDER	Gets or sets the edit field's placeholder text.
POSITION	Sets or reports the widget's position.
PRECISION	Controls the number of decimals that Logo prints.
PRINT.BITMAPS	Controls the printing of bitmaps and turtles.
RTop Start
REARLEFT	Reports the status of InO-Bot's rear left obstacle sensor.
REARLEFT	Reports the status of InO-Bot's rear left obstacle sensor.
REARRIGHT	Reports the status of InO-Bot's rear right obstacle sensor.
REARRIGHT	Reports the status of InO-Bot's rear right obstacle sensor.
RELAXED.SYNTAX	Relaxes the syntax requirements of Logo.
REMOVE	Removes a list box item.
REPLACE	Replace a listbox item text.
RESOLUTION	Outputs a two-element list of the current camera resolution.
ROW	Sets or reports the widget's row number in a grid.
ROWS	Gets or sets the number of rows in a grid.
RUN	Contains a runlist to be executed when a control has been clicked or changed.
RUN	Stores a runlist that Logo executes when the widget is clicked.
STop Start
SAVE	Saves the bitmap into an image file.
SCALE	Controls the widget's scaling.
SCREENSIZE	Reports the size of the browser window (Web) or the desktop (Desktop version).
SELECTED	Changes the input focus to the control.
SHADOW	Controls the widget's drop shadow.
SHAPE	Gets or sets the turtle's shape.
SHAPELOCK	Locks or unlocks a widget's rotation.
SIZE	Reports or sets the size of the widget's image size.
SIZE (DRAWSIZE)	Reports the size of the Graphics panel.
STACKSIZE	Controls the maximum number of nested procedure calls.
STAMP	Draws the bitmap.
STARTANGLE	Contains the starting angle of a widget if dropped.
STATE	Gets or sets the Selected state of a check box or radio button.
STATE	Controls the display mode of a panel.
STEPSIZE	Controls the number of pixels per step that the widget moves forward or backwards.
TTop Start
TAB	Controls the tab stop size used in the Listener's output field.
TEXT	Gets or sets the text of the control.
TEXTALIGN	Controls the alignment of the text within the control.
TITLE	Outputs the name of the currently attached camera.
TOOLTIP	Controls the contents of the widget's tool tip.
TOUCH	Reports touch data on touch screen equipped devices.
TURTLE.FONT	Controls the font used when creating a control.
TYPES	Gets or sets the allowed file types of a FILECHOOSER control.
UTop Start
USERNAME	Reports the user's name.
VTop Start
VALUE	Sets or gets the current value of a slider.
VELOCITY	Controls the speed at which a widget moves independently.
VERSION	Reports the Logo version number.
VISIBLE	Hides or shows the widget.
WTop Start
WINDOW	Reports the name of the Graphics panel that this widget is attached to.
WRAPMODE	Controls how the turtle reacts when it hits the edge of the Graphics panel.
WRAPMODE	Sets a widgets's individual wrap mode.
ZTop Start
Z.ORDER	Controls the sequence of widgets when displayed.

Variables

:Top Start
:CASE	Controls the conversion of quoted symbols to upper case.
:CURRENT.GRAPHICS	Contains the current graphics window name.
:DEFAULT.LAYOUT	Reports the default Logo panel layout
:EPSILON	Contains the minimum value that two numbers may differ to still be considered to be equal.
:ERROR	Contains the type of the last runtime error.
:ERRORTEXT	Reports the text of the last caught runtime error or THROWn word.
:FENCE	Defines the way turtles bounce off the edges of the Graphics screen.
:INITIAL.LAYOUT	Reports or sets the initial Logo panel layout
:LANGUAGE	Reports Logo's UI language.
:LAYOUT	Gets or sets the panel layout.
:LOGO.ENV	Contains a property list of global program and system settings.
:LOGOENGINE	Contains the ID of the currently running Logo engine.
:MIDI.OUTPUT	Contains the name of the music synthesizer that Logo uses to play music.
:MIDI.OUTPUTS	Returns a list of synthesizer names that Logo supports for playing music.
:PICTURE.FORMAT	Contains the default file extension for graphics files.
:PRECISION	Sets the precision in which numbers are printed.
:PREFS	System-wide properties.
:PROMPT	Gets or sets the prompt for the Listene.
:STANDARD.INPUT	The number of the input stream.
:STANDARD.OUTPUT	The number of the output stream.
:TAB	Sets the tab stop position.
:TRACE	Controls the output of debugging information.
:USERNAME	Reports the user name for local storage.

Operators

.Top Start
.EQ (=, EQUAL?, EQUALP)	Tests its inputs for equality.
.GE (>=, GREATEREQUAL?, GREATEREQUALP)	Tests if its first input is greater than or equal to its second input.
.LE (<=, LESSEQUAL?, LESSEQUALP)	Tests if its first input is less than or equal to its second input.
.LT (<, LESS?, LESSP)	Tests if its first input is less than its second input.
.NE (<>, !=, NOT.EQUAL?, NOT.EQUALP, NOTEQUAL?, NOTEQUALP)	Tests its inputs for inequality.
ATop Start
AND	Logical AND.
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DIFFERENCE (-)	Outputs the difference of two or more numbers.
GTop Start
GREATER? (>, GREATERP, .GT)	Tests if its first input is greater than its second input.
OTop Start
OR	Performs a logical OR on its input.
PTop Start
POWER (^)	Raises a number to the power of another number.
PRODUCT (*)	Calculates the product of its inputs.
QTop Start
QUOTIENT (/)	Reports the quotient of its inputs.
RTop Start
REMAINDER (%)	Outputs the remainder of two numbers.
STop Start
SUM (+)	Reports the sum of its inputs.