It’s possible to have several active turtles on the screen. By default, on Xlogo startup, only one turtle is available. Its
number is 0. If you want to "create" a new turtle, you can use the primitive setturtle followed by the number of
the turtle. To prevent 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 all classic primitives while you don’t change the active
turtle with setturtle. The maximum number of available turtles can be set in menu Options - Preferences - Tab
options.
Here are the primitives for the multiturtle mode: