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The World of Computer Software
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TURTLE.HLP
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turtle -- Command, one input. Abbreviation: tur
The input is the name of a turtle. You can only control one turtle at
a time, so using this command a second time releases the turtle previ-
ously selected. The names of floor turtles are numbers like 0 and 1.
If you are using a graphics display terminal (not just a text display
trminal), you can control the display turtle by using the word display
(or the abbreviation dpy) as the turtle name. (As usual, the word
must be preceded by a quotation mark.) If you use a graphics primi-
tive without selecting a turtle, Logo assumes that you want to use the
display turtle. But once you select a floor turtle, you must say tur-
tle "display explicitly to switch to the display.
The word off as input to the turtle command releases a floor turtle,
if you have one, or turns off the graphics display if you have been
using the display turtle. This also happens when you leave Logo.