1. All the features of a program or computer that overs the way people Interact with the computer. See command driven program and graphical user interface (GUI) utility program A program that assists you in maintaining and Improving the efficiency of a computer system. Mtcrosoft Plus! includes the System Agent, a utility program that defragments your hard disk, compresses rarely used files, and corrects manor disk problems You can set the System Agent to work any time you leave your computer alone for a certain period of tame, or to run early in the morning every day. From QUECID