Codes 3 and 4: Size Control
Special Codes
Code 7: Subshape
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Code 5 pushes (saves) and code 6 pops (restores) the current coordinate position while drawing a shape so that you can return to it from a later point in the shape. You must pop everything you push. The position stack is only four locations deep. If the stack overflows because of too many pushes or too many missing pops, the following message is displayed when the shape is drawn.
Position stack overflow in shape nnn
Similarly, if you try to pop more locations than have been pushed onto the stack, the following message is displayed when the shape is drawn.
Position stack underflow in shape nnn