aThe WM_KEYFIRST and WM_KEYLAST constants can be used as filter values to retrieve all messages related to keyboard input; the WM_MOUSEFIRST and WM_MOUSELAST constants can be used to retrieve all mouse messages. If the wMsgFilterMin and wMsgFilterMax parameters are both zero, the Get...
aThe GetMessage function only retrieves messages associated with the window identified by the hWnd parameter or any of its children, as specified by the IsChild function, and within the range of message values given by the wMsgFilterMin and wMsgFilterMax parameters. If hWnd is NULL, GetMessage...