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This message is received when the screen mode has been changed.
Calling Wimp_SetMode also causes this message to be broadcast.
Applications should not acknowledge this call.
After sending this message, the Wimp sends an Open_Window_Request message for each window.
No window should be deleted. Any window that needs to be deleted should simply be marked as needing deleted, deletion and do the necessary work when you receive the Open_Window_Request.