+ 20 New slotsize
+ 24 Owner's taskhandle
This message is broadcast when the user tries to alter a task's slot size by dragging the "memorybar" in the task manager. If a task can cope with this, it should first check the taskhandle, acknowledge the message and then call Wimp_SlotSize.
This message is also sent by the task manager when the task is started. If this, or any later message, is not acknowledged, the task will get a green memorybar in the task manager (instead of a red one) and will not receive this message again; it will not be possible for the user to alter the task's slotsize.
See PRM 3, page 241.
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