hwndDesktop (HWND) - input

Desktop-window handle.

HWND_DESKTOP

The desktop-window handle
Other
Desktop-window handle returned by WinQueryDesktopWindow.

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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