"Using the Services Snap-In" 1379
"Managing Services from a Command Prompt" 1404
A service is a specialized program that performs a function to support other programs. Many services operate at a very low level (by interacting directly with hardware, for example) and need to run even when no user is logged on; for this reason, they are often run by the System account (which has elevated privileges) rather than by ordinary user accounts. Microsoft Windows XP includes services as varied as the Event Log service, which keeps a database of event messages, and the Telnet service, which allows remote users to log on to your computer using a command-line interface.
In this appendix, you'll learn how to view the installed services; ...