Code -

Erm - I don't really know much about coding, but I will try to explain it as best I can.

Firstly - All different MU*'s have code behind them. It tells the MU what to do - and how to do it. Throughout the ages, the code has become substantially more efficient and easier to use. The most popular sources that are used now are SMAUG, CIRCLE, ROM and a few others in MUD's. Also, MUSH code is used for a variety of different MUSH's, such as PennMUSH and MUSH itself.

To code something - firstly you need to be fairly smart, and able to deal with people complaining. I know several people who were coders of MUD's, and quit because the mortals wanted to much. Next, you need a compiler and a general knowledge of Basic, or C. There are a few free compilers around - such as Cygwin.