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.
.MAYBEOUTPUT		Exits a procedure and outputs a value if present.
.WHO		Reports a list of widgets listening to commands.
ATop Start
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.
AND		Logical AND.
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.
ASCII	UNICODE	Converts a character into its Unicode value.
ASET		Sets the value of an array element.
ASHIFT	LSH	Shifts its input with sign extension.
ASK		Makes widgets 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 panel.
BOUNDS		Reports the drawing bounds of the Graphics panel.
BPCLEAR		Deletes all breakpoints.
BS	BLOCKSSCREEN	Arranges the Blocks, Graphics, Listener, and Editor panels.
BSV		Arranges the Blocks, Graphics, Lister and the Editor panels.
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, REMOVE	Removes elements from a word or a list.
BUTTON?	BUTTONP	Reports the state of the left mouse button.
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 panel and homes the turtle.
CLEARSCREEN	CS	Erases the Graphics panel and homes the turtle.
CLEARTEXT	CT	Clears the Listener panel.
CLOSE		Closes a stream.
COLOR		Reports the color for a name or value if possible.
COLORINDEX		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.
CONTENTS		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.
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 a widget.
DEFINE		Defines a procedure.
DEFINED?	DEFINEDP	Checks whether a procedure is defined.
DELETE		Deletes a file or a folder.
DIFFERENCE		Outputs the difference of two or more numbers.
DIR	DIRECTORY	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 Graphics panel and resets all turtles.
ETop Start
EACH		Applies a runlist to every widget 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 property 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 part 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.
EQUAL?	EQUALP, .EQ	Tests its inputs for equality.
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.
ES	EDITSCREEN	Makes the Graphics, Listener, and Editor panels visible.
ESV		Makes the Graphics panel, the Lister panel and the Editor panel visible.
EVAL		Runs a list and collects all outputs.
EVERY		Outputs a list of widgets.
EXP	EXPN	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.
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 display of the Graphics panel.
FROMMEMBER	FM	Removes the first part of its input until a specified word or list is found.
FS	FULLSCREEN	Switches to the Full Screen perspective
GTop Start
GETX	XCOR	Reports the X coordinate of a turtle.
GETY	YCOR	Reports the Y coordinate of a turtle.
GLIST		Reports the property lists that contain a property with a given name.
GO		Jumps to a label inside a procedure.
GPROP		Retrieves a property.
GREATER?	.GT, GREATERP	Tests if its first input is greater than its second input.
GREATEREQUAL?	.GE, GREATEREQUALP	Tests if its first input is greater than or equal to its second input.
GRID		Sets the characteristics of the graphics grid.
GRIDOFF		Hides the grid of the Graphics panel.
GRIDON		Displays the grid of the Graphics panel.
HTop Start
HALT		Stops one or all background programs.
HEADING		Reports the heading of the first active turtle.
HELP		Displays help for a command.
HIDETURTLE	HT	Hides all active turtles.
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.
INOBOT.CLOSE		Closes the connection to an InO-Bot
INOBOT?	INOBOTP	Tests if an InO-Bot is connected and ready to receive commands.
INT		Reports the integer part of a number.
IS.A		Checks an widget 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.
LESS?	.LT, LESSP	Tests if its first input is less than its second input.
LESSEQUAL?	.LE, LESSEQUALP	Tests if its first input is less than or equal to its second input.
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.
LOAD		Loads a file into Logo.
LOADPIC		Loads a picture.
LOADSHAPE		Loads a turtle shape from a file and sets the shape of all active turtles.
LOADSNAP		Loads a bitmap.
LOCAL		Declares local variables inside a procedure.
LOCALMAKE	LMAKE	Create and set a local name.
LOCKSHAPE		Prevents a bitmap from turning.
LOG	LN	Outputs the natural logarithm of its input.
LOG10		Outputs the logarithm of its input.
LOGAND	BITAND	Combines its inputs with a bitwise AND operation.
LOGNOT	BITNOT	Reports the bitwise logical complement of its input.
LOGOR	BITOR	Combines its inputs with a boolean OR operation.
LOGXOR	BITXOR	Combines its inputs with a boolean XOR operation.
LOWERCASE		Converts its argument to lower case.
LPUT		Appends an element to its input.
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 widget.
NOT		Negates its input.
NOTEQUAL?	.NE, NOT.EQUAL?, NOTEQUALP, NOT.EQUALP	Tests its inputs for inequality.
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.
OR		Performs a logical OR on its input.
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.
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.
POS	GETXY	Reports the coordinates of a turtle.
POT		Prints the title line of one or more user-defined procedures.
POTS		Prints the title line of all user-defined procedures.
POWER		Raises a number to the power of another number.
PPOS		Reports the turtle's polar position.
PPROP		Stores a property.
PPROPS		Sets 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.
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.
PRODUCT		Calculates the product of its inputs.
PROGRESSBAR		Displays a progress bar.
PSETHEADING	PSETH	Sets the polar heading of a turtle.
QTop Start
QUIT	EXIT, BYE	Ends Logo.
QUOTE		Quotes its input.
QUOTIENT		Reports the quotient of its inputs.
RTop Start
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.
REMAINDER		Outputs the remainder of two numbers.
REMPROP		Removes a property.
RENAME		Renames a 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.
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.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 transparency 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 Graphics panel.
SETCURDIR		Changes the current working directory.
SETFONT		Sets the turtle drawing font.
SETHEADING	SETH	Sets the heading of a turtle.
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.
SETPEN		Sets the pen characteristics.
SETPENCOLOR	SETPC	Sets the pen color.
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	SETTC	Sets the text color for Listener output.
SETTEXTFONT		Sets the Listener font.
SETTURTLENAME	SETTNAME	Sets the name of a turtle.
SETTURTLES	SETT	Creates a range of turtles.
SETTURTLESIZE	SETTSIZE, SETTS	Sets the scaling factor of a bitmap.
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 at which turtle commands are executed.
SPLIT		Splits a word into a list using a separator.
SQRT		Reports the square root.
SS	SPLITSCREEN	Displays the Graphics panel above the Listener panel.
SSV		Displays the Graphics panel to the left of the Listener panel.
STAMP		Draws a bitmap or turtle.
STAMPOVAL		Draws an oval.
STAMPRECT		Draws a rectangle.
STAMPRECTC		Draws a rectangle centered around the turtle position.
STEP		Turns on stepping for the given elements.
STEPPED		Outputs a structured contents list of all stepped elements.
STEPPED?	STEPPEDP	Outputs TRUE if the element described by its input is stepped.
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.
SUM		Reports the sum of its inputs.
TTop Start
TAN		Reports the tangent.
TELL		Defines a list of turtles (or other widgets) 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		Outputs the structure of an array as a word.
TEXTCOLOR		Reports the text foreground and background colors.
TEXTFONT		Reports the font used for output.
THEN		Starts the THEN part 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.
TRACED?	TRACEDP	Outputs TRUE if the element described by its input is traced.
TS	TEXTSCREEN	Minimizes the Graphics panel and maximizes the Listener panel.
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		Downloads an obstacle avoidance routine to Tuff-Bot.
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 panel.
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.
UNFREEZEPIC		Unfreezes the display of the graphics.
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 turtles (or other widgets) 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 Graphics panel.
WRITEFILE		Stores a Logo word or list into a file.
XTop Start
XLIST		Concatenates its inputs to a parenthesized list.

Properties

ATop Start
ALPHA		Controls the transparency of the colors the turtle uses to draw.
ANCHOR		Controls the anchoring of a widget.
ARRAYBASE		Controls the lowest array or grid index.
AUTOSAVE		Controls the amount of data that Logo saves and restores automatically.
AUTOSCROLL		Controls a vertical scroll bar.
BTop Start
BACKGROUND		Controls the background color of a control.
BATTERY		Reports the battery level of InO-Bot.
BGCOLOR		Controls the background color of the Graphics panel.
BGPATTERN		Controls 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.
CAMERA		Controls which camera is active.
CAMERAS		Outputs a list of camera names.
CASE		Makes Logo convert its input to upper case or not.
COLOR		Controls the text color of a control.
COLORED.TURTLES		Displays turtles with their pen color.
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.
ETop Start
ENABLED		Enables or disables a widget.
ENVIRONMENT		Reports the device that Logo is executing upon.
FTop Start
FILTER		Gets or sets the edit field's input filter.
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.
FRONTRIGHT		Reports the status of InO-Bot's front right obstacle sensor.
FROZEN		Reports TRUE if the graphics are frozen.
FULLSCREEN		Controls whether to have Terrapin Logo occupy the entire screen or
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.
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
LBAPPEND		Appends one or more items to the list box.
LBCLEAR		Erases the contents of the list box.
LBFIND		Finds a list box item.
LBINSERT		Inserts one or more items into a list box.
LBITEM		Outputs a list box item by index.
LBREMOVE		Removes a list box item.
LBREPLACE		Replace a listbox item text.
LIGHT		Reports the status of InO-Bot's light sensor.
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.
LINERIGHT		Reports the status of InO-Bot's right line sensor.
LISTENER.LINES		Controls the maximum number of lines in the Listener panel.
LOCATION		Sets or reports the icon bar's location.
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.
OTop Start
OFFSET		Controls the location of the Graphics 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.
REARRIGHT		Reports the status of InO-Bot's rear right obstacle sensor.
RESOLUTION		Outputs a two-element list of the current camera resolution.
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
SCALE		Controls the widget's scaling.
SCREENSIZE		Reports the size of the browser window
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 the size of the Graphics panel.
SIZE		Reports or sets the size of the widget's image size.
STACKSIZE		Controls the maximum number of nested procedure calls.
STARTANGLE		Contains the starting angle of a widget if dropped.
STATE		Gets or sets the Selected state of a check box.
STEPSIZE		Controls the number of pixels per step that the widget moves forward or back.
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.
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		Reports the panel's visibility
VISIBLE		Reports the panel's visibility
VISIBLE		Reports the panel's visibility
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 a widget reacts when it hits the edge of the Graphics panel
WRAPMODE		Sets a widget's individual wrap mode.
ZTop Start
Z.ORDER		Controls the sequence of widgets when displayed.

Variables

		Top
:CASE		Makes Logo convert its input to upper case or not.
:CURRENT.GRAPHICS		Contains the current graphics window name.
:EPSILON		Contains the minimum value that two numbers may differ to still beconsidered 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.
: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 Listener.
: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.

Operators

		Top
!=	<>	Tests its inputs for inequality.
%		Outputs the remainder of two numbers.
*		Calculates the product of its inputs.
+		Reports the sum of its inputs.
-		Outputs the difference of two or more numbers.
/		Reports the quotient of its inputs.
<		Tests if its left input is less than its right input.
<=		Tests if its left input is less than or equal to its right input.
=	==	Tests its inputs for equality.
>		Tests if its left input is greater than its right input.
>=		Tests if its left input is greater than or equal to its right input.
^		Raises a number to the power of another number.