plural of mail user agent

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

(graphical user interface) A graphical user interface designed for televisions and thus requiring much larger visual elements than those used on computers and smartphones, as well as the ability to be operated by a simple remote control.

plural of 10-foot user interface

(law, copyright law) A contract between the manufacturer or copyright holder, also commonly called the licensor, of an end product and a person, commonly called the end user, that specifies the licenses under which the end user may utilize the end product, subject to restrictions as specified in the contract or agreement.

plural of end user license agreement

(computing, informal) A conceptual space outside the kernel in which a user's applications can run without the risk of damage to the operating system.

(computing) The established group of users for a particular computer program, technology, etc.

plural of userbase

(Wiktionary and WMF jargon) A simple, standardised box placed on a webpage to indicate the user's proficiencies or preferences.