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1. ACS

Advanced Communications Services.

2. ADP

Automatic Data Processing. The processing of information by means of a computer.

3. AOL

Acronym for America Online http://www.aol.com

4. Back Door

A means of disabling a system's security which is deliberately left by designers of the system, often to give access to service technicians or maintenance programmers.

5. Backup

To make copies of important files in case the originals are damaged. Data can be backed up on external hard drives, floppy discs, CD-ROMs, tape, etc.

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