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From: mikey@eukanuba.wpd.sgi.com (Mike Yang)
Newsgroups: comp.windows.x
Subject: Re: IS THERE A WINDOW MGR ?
Message-ID: <1990Sep20.161011.15073@relay.wpd.sgi.com>
Date: 20 Sep 90 16:10:11 GMT
References: <772@bbking.KSP.Unisys.COM>
Sender: news@relay.wpd.sgi.com ( CNews Account )
Reply-To: mikey@sgi.com
Organization: Silicon Graphics, Inc.
Lines: 18

In article <772@bbking.KSP.Unisys.COM>, rmarks@KSP.Unisys.COM (Richard Marks) writes:
|> Could someone tell me how a client program can determine
|> if there is a window manager running for a given screen?
|> 
|> I am looking for a general mechanism.  I know I can code
|> up specific tests for the WM's currently available on
|> my clients.

Most window managers these days select for SubstructureRedirect on the
root window, so that they can reparent application windows.  Since
only one client per window can select for these events, try selecting
for SubstructureRedirect on the root window of the screen.  If an
error occurs (use an error handler), you can assume that a window
manager is running.

-----------------------------------------------------------------------
                 Mike Yang        Silicon Graphics, Inc.
               mikey@sgi.com           415/335-1786