1. A method for multi-user animation comprising: modeling a three-dimensional space within a computer memory; locating an avatar within the three-dimensional space, the avatar being responsive to input commands from a client to act within the modeled three-dimensional space; monitoring the input commands to determine a period of time the client is inactive, wherein the period of time the client is inactive is determined using cessation of any user input commands regardless of whether the commands cause movement of the avatar; and removing the avatar from the space in response to determining that the client has remained inactive for a threshold period of time.