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1990-06-11
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penreverse -- Command, no inputs. Abbreviation: px
This command tells the display turtle to lower its "reversing pen";
thereafter, when the turtle moves, it turns on any points which were
off, and turns off any points which were on. The commands penup, pen-
down, penerase, and penreverse are mutually exclusive; whichever was
most recently used is the one which affects the turtle. (Note:
Graphics terminals which cannot penreverse will treat this command as
pendown.)