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

plural of user guide

plural of magic user

Alternative form of multiuser

(computing, slang) An unspecified person or user on a computer network.

A potential bias in epidemiologic studies, involving the fact that subjects who voluntarily enroll in a clinical trial and actually follow the experimental regimen are likely to be healthier than the general population.

plural of healthy user bias

(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.