fSkip (BOOL) - input
TRUE
No message is passed in when fSkip is set to TRUE. The pQmsg parameter is NULL in this case.
When the hook is called with fSkip set to TRUE and there are no further messages to pass in, the MsgInputHook hook must be released using WinReleaseHook.
As long as the hook procedure is called with fSkip set to FALSE, the hook must continue to return the same message.