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LRESULT WINAPI SendMessage(
_In_ HWND hWnd,
_In_ UINT Msg,
_In_ WPARAM wParam,
_In_ LPARAM lParam
A handle to the window whose window procedure will receive the message. If this parameter is HWND_BROADCAST
((HWND)0xffff), the message is sent to all top-level windows in the
system, including disabled or invisible unowned windows, overlapped
windows, and pop-up windows; but the message is not sent to child
Message sending is subject to UIPI. The thread of a process can send
messages only to message queues of threads in processes of lesser or
equal integrity level.
The message to be sent.
For lists of the system-provided messages, see System-Defined Messages.
Additional message-specific information.
The return value specifies the result of the message processing; it depends on the message sent.
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