USM
Unsharp masking. A process used to sharpen images.

UUCP
UNIX-to-UNIX Copy Program. This was initially a program run under the UNIX operating system that allowed one UNIX system to send files to another UNIX system via dial-up phone lines. Today, the term is more commonly used to describe the large international network which uses the UUCP protocol to pass news and electronic mail.

Uncover
A database of book reviews, magazines, and articles, including FAX article delivery. It provides table of contents information for over 14,000 journals in all disciplines held by the libraries in the Colorado Academic and Research Libraries consortium and provides on-line access to ERIC, at education database. Coverage for most journals begins with 1989.

UNICOS
A version of the UNIX operating system adapted for CRAY computers.

UNIX
An operating system developed by Bell Laboratories that supports multiuser and multitasking operations.

Upload
Send a file to another computer using a modem.

UPS
Uninterruptible Power Supply. A unit that switches to battery power whenever the power cuts out.

URI
Uniform Resource Identifier, a string of characters that represents the location or address of a resource on the Internet and how that resource should be accessed. A URI is a superset of the Uniform Resource Locator.

URL
Uniform Resource Locator, a string of characters that represents the location or address of a resource on the Internet and how that resource should be accessed. World Wide Web pages are assigned a unique URL. Each hyperlink on a web page contains the URL of the page to be linked to. http://rohan.sdsu.edu/glossary.html is the URL for this page.

USENET
A network of newsgroups. There are thousands of newsgroups available through USENET. Each one covers a specific topic or subject area.

User Id
The string of characters that identifies you. The name by which you are known to the network. Also known as username.

UUCP
UNIX-to-UNIX Copy Program, a program that lets you copy files between UNIX systems. UUCP protocols are used to transfer news and Email messages through USENET.
   
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