AFK - Away From Keyboard. Client - A program that takes the place of telnet. Newbie - New user. Some people take MUDing very seriously, and get very ticked at you if you go where you haven't been asked. Some people are very private about their real life lives.
People are generally helpful, just ask nicely.
Don't be surprised by the kind of people you meet, and the kind of places you'll go. Or something like that. This Project Galactic Guide site owned by Alex McLintock .