Not-square application windows?

[Alessandro Bottoni <Alessandro Bottoni think3 com>]

In this page:
http://www.gnome.org/screenshots/index.shtml (see last screenshots)
I noticed that Gompeg (that I don not have on my PC) has a not-square
interface (three connected circles).

Does it mean that using GNOME/GTK++ I can create GUI application with "round
windows" or something like that? Where can I find more info?

Thanks
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Alessandro Bottoni (Alessandro.Bottoni@Think3.com)
Web Programmer @ Think3 inc. (www.think3.com)
I do not speak for think3 and they return the favour