Glossary - O


on-demand connection
a dial-up link to a service provider that's available whenever it's needed (on demand, get it?).
a term that indicates that information, activity, or communications are located on, or taking place in, an electronic, networked computing environment (like the Internet). The opposite of online is offline, which is what your computer is as soon as you disconnect from the Internet.

OS (Operating System)
the underlying control program on a computer that makes the hardware run, and supports the execution of one or more applications. DOS, UNIX, and OS/2 are all examples of operating systems.


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