Multiturtle Mode

It's possible to have several active turtles on the screen. By default, on Xlogo startup, only one turtle is available. Its number is the 0. If you want to "create" a new turtle, you can use the primitive setturtle followed by the number of the turtle. To prevent from obstruction, the turtle is created on the origin and is invisible (you must use showturtle to show it). Then, the new turtle is the active turtle, it obeys to all classic primitives while you don't change active turtle with setturtle. The maximum number of available turtle can be set in menu Options - Preferences - Tab options.

Here are the primitives for the multiturtle mode:

Primitives	Argumentss	Utilisation
sturtle, setturtle	a: number	The turtle numero a is now the active turtle. By default on Xlogo startup the active turtle is the numero 0.
turtle	none	Returns the numero of the active turtle.
turtles	none	Returns a list which contains all the numero af the turtles actually on the screen.
killturtle	a: number	Kill the turtle number a
setTM, setturtlesmax	integer	Set the maximum number of turtles for multiturtle mode.
tm, turtlesmax	none	Returns the maximum number of turtles for multiturtle mode.