mk47at: But you need a unique cd key, which gog doesn't provide (unless I'm mistaken).
Firebrand9: I have a physical copy of
RTCW Collector's Edition purchased when the game first came out, which comes in a metal tin. When I first bought the game, my buddy would come over and play online. The funny part (well... somewhat anyways) was that the legitimate key that came with it was *already activated online*. People made keygen's for that game and used them, which ended up screwing people who bought it honestly, like myself. My buddy had to get a hold of that keygen and printed a list of alternates just to play it, as the legitimate key was no good to us.
The takeaway? See if you can get your hands on that keygen for it if you know you bought a copy of the game. Most of the people online are using one anyways, so if GOG gave actual keys with the game, there's a very high likeliehood they wouldn't work.
~
Alternatively, unless you need the vanilla experience, as Terpor said, you're probably better off just playing Enemy Territory which still has active player rosters and servers (AFAIK) :
http://www.splashdamage.com/content/download-wolfenstein-enemy-territory Strange, I've never had any problems with the key that I received when I bought the game the first time.
I've played both games online. I think I spent more time playing Enemy Territory. It's a great game, but there are some maps from the original game that are a lot of fun. The original was playable with a lower number of people, as well.