question with buddy key

can u give the buddy key to more than one person?
and what is the epic key for
sorry i am a noob.

You can give buddy key to only 1 person.

I get epic key when i bought Nightfall and I could try Prophecies and Factions with it.

A key can only be used once. Epic key is trial for all campaigns.

You might want to try the Q&A forum for other questions:
http://www.guildwarsguru.com/forum/f...splay.php?f=14