pswp (PSWP)
The structure has been filled in by the WinSetWindowPos function with the proposed move or size data. The control can adjust this new position by changing the contents of the SWP structure. It can change the x or y fields to adjust its new position; or the cx or cy fields to adjust its new size, or the hwndInsertBehind field to adjust its new z-order.
flzero (ULONG)
flResult (ULONG)
These indicators are passed on to the WM_WINDOWPOSCHANGED message that is sent after the window state change has occurred. Bits 0 through 15 of this parameter are reserved for system use and bits 16 through 31 are available for application use.