SunView - Processing whilst Iconized

[Timothy J. Stone]

I am trying to persuade an application to run a specific function after
the program has been iconized.  In particular, when a specific button is
pressed, I want to push the required action on a stack and do a 

	window_set(frame, FRAME_CLOSED, TRUE, 0);

and then use the interposer to catch an event AFTER the window is
iconized.

No matter how I do it, the window closes but the icon doesn't show until
after the long-running function completes even with
notify_next_event_func() and window_release_event_lock(frame).

Any ideas or code fragments would be most gratefully received.