I haven't had time to try it, but here's an approach I'd like to try.
If you beat me to it, I will buy you a beer!

Squeak on X11 is an X11 client application. Here's the hook: so is
your re-parenting window manager. Check out the sources for a minimal
re-parenting window manager like AEWM. Most of the C code can be
rewritten in Squeak. Since a window manager is just a client like any
other app in X11 land, it follows that we should be able to implement
one in Squeak. Then, Squeak can replace the window management role in
the X11 ecosystem, and you'll have firefox running in a SystemWindow,
along with any other X11 app that your heart desires.

It's a bit of work, though. Could be pretty powerful, all the same.

On Monday, February 8, 2010, Gary Dunn <osp at aloha.com> wrote:
> On Mon, 08 Feb 2010 17:06:59 -0800 Andreas Raab <andreas.raab at gmx.de> wrote:
>> Gary Dunn wrote:
>>> Does Squeak have a class that provides a window with content coming from
>> a host GUI
>> systcm app such as Firefox? I see something like that in Cobalt. I found a
>> simple shell
>> capability but nothing that can display a windowed app.
>>
>> I think what you've seen in Cobalt was based on VNC access to a remote
>> machine. If that's what you're looking for check out the RFB package
>> which implements the VNC protocol.
>
> Thanks, Andreas. I will do that. Remember how Windows when it was new could overcome missing functionality by running apps like MultiMate and Lotus 1-2-3 in a window? That's what I want for Squeak except extended to support X.
> --
> Gary Dunn, Honolulu
> osp at aloha.com
> http://openslate.net/
> http://e9erust.blogspot.com/
> Sent from a Newton 2100 via Mail V
>
>

-- 
Ron