Device/Window_State on the Mac

[landsman(at)stars.gsfc.nasa.gov (Wayne Landsman)]

I have a suite of image display programs that make fair use of the WINDOW_STATE
keyword to the DEVICE command, i.e.

DEVICE, WINDOW_STATE = x

returns a vector containing 1 element for each possible window, and a 1 if the
window is opened, and a 0 if it is closed.      Unfortunately, this keyword 
is only available for X-windows (VMS & Unix) and Windows, so my programs fail
when I try to run them on a MAC.  

Does anyone know if there is an alternate way of getting this information under
Macintosh IDL?

Thanks, --Wayne Landsman                          landsman@mpb.gsfc.nasa.gov