GetGrayRgn
GetGrayRgn Return a handle to the current desktop region
#include <Windows.h> Window Manager
returns address of desktop stored in GrayRgn global
variable
This function returns a handle to the current desktop region, potentially
crossing multiple devices, that consists of everything below the menu bar.
Returns: a regionHandle identifying the desktop region that is currently
stored in GrayRgn.

Notes: The global variable GrayRgn is the region below the menu bar, including
all real estate on multiple screens.