PMask(unsigned long nMaskObjectID);
Object ID of PageMaker-drawn box, oval, or polygon to use as mask.nMaskObjectID. While you can mask any object on the page, you can use only PageMaker-drawn boxes, ovals, or polygons as the masking object. If nMaskObjectID is not the ID of a PageMaker-drawn box, oval, or polygon, the PMask command does nothing.
kParmDefault to use the top-most PageMaker box, oval or polygon.
Example. The following example selects two objects and masks them with the specified object (object number eight).
PSelect(1);
PSelectExtend(2);
PMask(8);
The PGetGroupList, PGetObjectIDList, PGetObjectIDListTop, PGetSelectIDList, and PGetSelectIDListTop queries
Adobe PageMaker 6.5 Help > Commands > Element > Mask
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