CLEAR_VP clears the drawlist of the specified viewport.
---->(CLEAR_VP)---|viewport|---->
This action has no options.
Use this action to clear the drawlist of the specified
viewport.
The following parameter sequence clears the drawlist of
"vport1".
CLEAR_VP "vport1"
All viewport names must be entered enclosed by double quotes
(" ").
REMOVE_FROM_VP_DRAWLIST interrupt action
ADD_TO_VP_DRAWLIST interrupt action
SELECT_VP_SA subaction