Sample
This code enters ReGIS mode and uses the S command to erase the screen with (E) and then turns on the visible cursor with (C1). P moves the pen to 100,440 absolute. V(S),,,,(E) draws a series of lines, first pushing the current pen location onto the stack with (S), then drawing three lines using relative coordinates, and then using (E) to pop the previously saved location off the stack and draw to it. The result is a rectangle 100 by 10 pixels in size.
P,F(C) then moves to a new location, and uses the "F"ill command to wrap a "C"ircle. The fill command could wrap any number of commands within its parentheses, allowing it to fill complex shapes. It also allowed the inclusion of a "temporary write" that allowed the programmer to set the fill style within the fill, and abandon it as soon as it ended.
Read more about this topic: Re GIS
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