LAST_WINDOW_VP redisplays the previous window onto the
specified viewport.
---->(LAST_WINDOW_VP)----|viewport|---->
This action has no options.
Use this action to redisplay the previous window onto the
specified viewport.
This action could be used to toggle between two different
windows onto the same viewport, when performing a
difficult operation.
The following parameter sequence redisplays the previous window
onto the specified viewport.
LAST_WINDOW_VP [specify viewport]
RECALL_LAST_WP terminate action
RECALL_LAST_WP_SET terminate action
SELECT_VP_SA subaction