Andrew Cates knows What is TCl as he used TCl a lot on alta vista customisations and is happy to join The Tcler's Wiki, and be one of the Welcome Visitors.
He has a homepage at [L1 ] and his email is his christian name at his homepage.
He knows about how Wikis work, How do Wiki Categories work and so on from other WIkis e.g. [L2 ] Meatball and [L3 ] Ward's Wiki, which are good places to look if you cannot find him.