api for programmatically getting a list of all windows

[Dan Hitt]

I would like to programmatically get a list of all windows on
my screen in a gnustep application.

I suppose i could shell out and call
   xwininfo -tree -root
and then parse the output, but i imagine there must
be a much more systematic way to do this involving
standard gnustep classes.

(I did google around, but not very successfully.)

Thanks in advance for any clues!

dan