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This function retrieves the identifier of the thread that created the specified window and, optionally, the identifier of the process that created the window.
[in] Handle to the window.
[out] Pointer to a 32-bit value that receives the process identifier. If this parameter is not NULL,
GetWindowThreadProcessId copies the identifier of the process to the 32-bit value; otherwise, it does not.
The return value is the identifier of the thread that created the window.
Header winuser.h Windows Embedded CE Windows CE 1.0 and later Windows Mobile Windows Mobile Version 5.0 and later
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