http://www.starwars.com/databank/location/kashyyyk/eu.html)
some infos of a rpg:
http://home.adelphia.net/~allard/katarn.htm)
Excerpt of an old DF faq:
http://www.cheatfiles.com/other/darkforcesfaq.txt)
1.7 Is DF canon?
DF itself is probably not canon (meaning 'in Star Wars continuity'), but
that's not to say it isn't tied into Star Wars continuity. Kyle Katarn's
first mission takes place shortly before the events of _Star Wars: A New
Hope_ (Episode IV).
BTW, 'katarn' (the surname of the protagonist in DF) is the name of a
predator on the Wookie homeworld of Kashyyyk. In the Star Wars book _Heir to
the Empire_, written by Timothy Zahn (the first book in his trilogy), there
is a Lieutenant Page who heads a New Republic group called the 'Katarn
Commandos.' It is unknown whether the LA design team consciously named the
protagonist of DF after either the commandos or the animal.