An object consists of a collection of functions (also called ‘methods’) and data (variables) on which the functions operate. The only way to manipulate the data contained in an object is via one of the functions defined by the object.

Every single thing in a mud is an object. Rooms are objects. Weapons are objects. Even your character is an object (a special kind of object called “interactive” but still an object in most every respect). Each object (except possibly virtual objects) in the mud is associated with some file written in LPC (in the mud’s directory structure) that describes how the object is to interact with the gamedriver and the rest of the objects in the mud.