Just some ideas off the top of my head ( since you didn't give many details). Like what do you mean..."populate all gnome windows" ? Do you mean every virtual desktop, or every gnome-based application which you launch?
FWIW, there are 2 types of shells within bash, the -i and -l options. There are a different set of rc files which get run, depending on whether it's a 'login' shell or an 'interactive' shell. For bash, read man bash and look for the INVOCATION section. It tells you which file will be read for a login, and you can probably put your launching statement in that file.
Of course, you probably need a graphical logon for it to work, because Tk needs a X server to talk to. But there are tests you can do, to see whether you are in X or not.
Just as another "coffee-room-comment", maybe you should look at Gtk2-perl , instead of Tk, if you are using gnome. There are bindings to the gnome libs withing Gtk2-perl, and may be helpful to you, like "taskbar" apps.
I'm not really a human, but I play one on earth.
flash japh
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