The default window procedure sets ulReserved to 0 and sends the following messages, based on the values of the fl parameter of the first SWP data structure:

SWP_SIZE

A WM_SIZE with the new window size from the first SWP structure
SWP_HIDE
A WM_SHOW to hide the new window
SWP_SHOW
A WM_SHOW to show the new window.

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