(computing, telecommunications) Of a operating system, etc., only capable of serving one user at a time, not many users simultaneously.

A manual intended to assist in the use of a particular system.

plural of user guide

plural of magic user

(computing) A type of user interface which allows people to interact with a computer through a metaphor of direct manipulation of graphical images and widgets in addition to text.

(Internet) A communications protocol that has no error recovery features, and is mostly used to stream material over the Internet.

(computing) A program or subroutine, provided by the user rather than being built into the system, that may return a value and may take input parameters.

plural of character user interface

(computer games) A text-based online game in which players enter instructions on a command line to jointly engage in role-playing. MUDs are a precursor to the massively multiplayer online game.

(computing, dated) A graphic symbol defined by the user, replacing one of the text characters in the computer's character set.