Retrieves the visibility state of the specified window
_WinAPI_IsWindowVisible ( $hWnd )
|$hWnd||Handle of window|
|True:||window is visible|
|False:||window is not visible|
The visibility state of a window is indicated by the $WS_VISIBLE style bit. When $WS_VISIBLE is set, the window
is displayed and subsequent drawing into it is displayed as long as the window has the $WS_VISIBLE style.
Search IsWindowVisible in MSDN Library.