I found this under a post from a certain 'Paul':
Under 'Study Groups', I found this:
Most of these groups use my Guided Text Study System study group software.
[So it's GTSS, not GTTS ... ] If you are interested in learning more about how GTSS works, please see "this not yet finished documentation" http://www.greekgeek.org/gtss.pdf. This document will also tell you how to login to GTSS as a 'guest'
I confess I couldn't work out how to login as a guest. If you can, let me know! Seemingly you must be assigned a userID and password, but how that happens is beyond me.
No D'Ooge group listed, by the way.