The main frame between the top menu and bottom page (which is itself another frame page) is home.html in the admin template set (/path/to/gforum/admin/templates/admin/home.html).

The right/left frames are in other templates - for example, the "Markup" frame is in markup.html, the setup one is in setup.html, etc. Generally, the files without underscores are the frame pages.

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Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com