What is the difference between softcode and hardcode?

Hardcode is the code (usually written in C) that MUSH games are written in. The hardcode runs the game itself, and lets people connect, use commands like "move" and "say" and "pose", etc. Softcode is a language (written in C, as a part of the hardcode) that can be used inside the game for setting attributes, sending messages to players, and writing custom commands.