WM_OPEN - Parameters

usPointer (USHORT)

Input device flag.

TRUE

Message resulted from pointer event
FALSE
Message resulted from keyboard event

ptspointerpos (POINTS)

Pointer position.

The pointer position is in window coordinates relative to the bottom-left corner of the window. This value is ignored if usPointer is not set to TRUE.

rc (BOOL)

Processed indicator.

TRUE

Message processed
FALSE
Message ignored.

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