OOF2: The Manual
OOF.ElementSelection.Undo — Undo the latest Skeleton element selection operation.
Skeleton maintains a stack of previous
Elements are selected or deselected, a new
version is pushed onto the stack. The Undo
pops the latest version off of the stack, thereby reverting to the
previously selected set of
Elements. The popped set is not
destroyed -- it can be recovered with the OOF.ElementSelection.Redo command.
The selection stack is not infinite. When it is full, the oldest selection will be lost when a new selection is made.