http://www.cardhunter.com/faq/ is outdated, it says there's no co-op play and implies you can only play via browser. (Some people may not try the game if they think there's no co-op...)
Hmm, yeah that could use a revamp (or removal). Meanwhile, try this comprehensive knowledge base, or this other shorter faq.
Thanks for noticing. I've updated the FAQ and it will get rolled out next time we deploy a website update.