It's difficult for searches on sites such as these to pick up three letter "words" (I was searching for GTD)
But by using google and typing in this "gtd" site GT40s.com - Powered by vBulletin
and substituting your three letter word for GTD, google will search for you.
Shamelessly cribbed from the TR6 forum where it seems to work better than here? maybe it's not so good after all?