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Unicode
A 16 bit ISO 10646 character set. It can accommodate way more characters that ASCII, thus allowing for easier internationalization.
UNIX
A computer operating system (the basic software running on a computer, underneath things like word processors and spreadsheets). UNIX is designed to be used by many people at the same time (it is multi-user) and has TCP/IP built-in. It is the most common operating system for servers on the Internet.
Unix Hosting
Web hosting that supports Unix, an operating system that comes in several proprietary versions.
Unlimited Bandwidth
A claim that users of a hosting plan will not be charged extra fees for very high levels of data transfer.
UPS
(Uninterruptible Power Supply) - UPS keeps the server running on a battery for several minutes after a power outage, allowing for a clean shutdown without loss of data. UPS can also shield the server from line voltage spikes and drops.
Uptime Guarantee
An assurance that a hosting company's uptime will meet an agreed-upon percentage.
URL
(Uniform Resource Locator) - The standard way to give the address of any resource on the Internet that is part of the World Wide Web (WWW). A URL looks like this: http://www.communitech.net/glossary/ or telnet://anywhere.you.want or news:new.newusers.questions etc. The most common way to use a URL is to enter into a WWW browser program, such as Netscape, or Lynx.
UTP
(Unshielded Twisted Pair) - Similar to the STP, but without the shielding metal layer. It is more prone to interference but is less bulky that the STP cables.
UUencode
It is a method of sending binary files using email - similar in purpose to MIME.
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