This hook is intended for simulated user input, and only mouse and keyboard messages should be passed in. All other messages will be discarded. Mouse and keyboard messages injected into this hook will have the same effect as if they were generated by the mouse or keyboard device driver. The messages are routed in the same manner as normal user input.
The pfNoRecord parameter defaults to TRUE, implying that messages received from the MsgInputHook hook will not be recorded in the JournalRecordHook hook. Injected messages should not be recorded unless necessary.
When all messages have been passed in the application must remove the MsgInputHook hook using WinReleaseHook.