AMT Datasouth PAL - Manual (Page 93)

87
dup
dup
Description
Pushes a second copy of the top-most object on the operand stack.
Usage
Any dup Any Any
Any Any. Stack object to duplicate.
Comments
This operator performs the same function as the PAL sequence "1 copy". It simply duplicates the
top-most object on the operand stack. For composite objects, the source and duplicate objects will
share the same composite data.
Hints
The copy operator discussion includes examples which show the subtle difference between copy
and dup when duplicating composite objects.