Returns a slide structure that be supplied re-slide to make a copy of the slide or slide->pict to re-extract the entire slide as a pict.
Cancels the most recently created slide, and also returns a slide structure that be supplied to re-slide to restore the slide (usually in a later position).
Re-inserts a slide, lt-superimposeing the given additional pict.
Converts a complete slide to a pict. The bounding box of the result corresponds to the slide within its margins.