flStatus (ULONG) - returns

      Status information.

      Summary

        Summary of message types existing on the queue.

        This field contains a combination of the following values:

        QS_KEY

          An input event (keyboard or journaling) has caused a WM_CHAR message to be placed in the queue.
        QS_MOUSE
          An input event has caused a WM_MOUSEMOVE, WM_BUTTON1UP, WM_BUTTON1DOWN, WM_BUTTON1DBLCLK, WM_BUTTON2UP, WM_BUTTON2DOWN, WM_BUTTON2DBLCLK, WM_BUTTON3UP, WM_BUTTON3DOWN, or WM_BUTTON3DBLCLK message to be placed in the queue.
        QS_MOUSEBUTTON
          An input event has caused a WM_BUTTON1UP, WM_BUTTON1DOWN, WM_BUTTON1DBLCLK, WM_BUTTON2UP, WM_BUTTON2DOWN, WM_BUTTON2DBLCLK, WM_BUTTON3UP, WM_BUTTON3DOWN, or WM_BUTTON3DBLCLK message to be placed in the queue.
        QS_MOUSEMOVE
          An input event has caused a WM_MOUSEMOVE message to be placed in the queue.
        QS_TIMER
          A timer event has caused a WM_TIMER message to be placed in the queue.
        QS_PAINT
          A WM_PAINT message is available.
        QS_SEM1
          A WM_SEM1 message is available.
        QS_SEM2
          A WM_SEM2 message is available.
        QS_SEM3
          A WM_SEM3 message is available.
        QS_SEM4
          A WM_SEM4 message is available.
        QS_POSTMSG
          A message has been posted to the queue. Note that this message is probably not one of the messages listed above, but could be a WM_CHAR, WM_MOUSEMOVE or similar message if an application has posted one of these. In this case, the corresponding input status flag (QS_KEY, QS_MOUSE, and so on) is not set.
        QS_SENDMSG
          A message has been sent by another application to a window associated with the current queue.
        Added
          Message type additions.

          Message types added to the queue since the last use of this function. The value of this field is a subset of the Summary field.

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