AMT Datasouth PAL - Manual (Page 69)

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cleartomark
cleartomark
Description
Discards all objects from the operand stack down to, and including, the top-most mark object.
Usage
Mark NAny..1Any cleartomark
Mark Mark. Top-most mark object on the stack.
NAny..1Any Any. All objects on the operand stack above the top-most mark object.
Comments
The cleartomark operator discards all objects from the operand stack above the top-most mark
object. The operator also discards the mark object itself.
By pushing a mark object onto the stack, the programmer can later restore the stack to that prior
level simply by using the cleartomark operator.