hwnd (HWND) - input

Window handle.

NULL

The message is posted into the queue associated with the current thread. When the message is received by using the WinGetMsg or WinPeekMsg functions, the parameter of the QMSG structure is NULL.
Other
Window handle.

ulMsgid (ULONG) - input

Message identity.

mpParam1 (MPARAM) - input

Parameter 1.

mpParam2 (MPARAM) - input

Parameter 2.

rc (BOOL) - returns

Message-posted indicator.

TRUE

Message successfully posted
FALSE
Message could not be posted; for example, because the message queue was full.

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