Apple Mac OS X Server Print Service Administration For Version 10.4 or Later Manual do Utilizador descarregar pdf (Página 226)

226 Glossary

Tomcat The official reference implementation for Java Servlet 2.2 and JavaServer Pages

1.1, two complementary technologies developed under the Java Community Process.

TTL Time-to-live. The specified length of time that DNS information is stored in a

cache. When a domain name-IP address pair has been cached longer than the TTL

value, the entry is deleted from the name server’s cache (but not from the primary DNS

server).

UDP User Datagram Protocol. A communications method that uses the Internet

Protocol (IP) to send a data unit (called a datagram) from one computer to another in a

network. Network applications that have very small data units to exchange may use

UDP rather than TCP.

UID User ID. A number that uniquely identifies a user within a file system. Mac OS X

computers use the UID to keep track of a user’s directory and file ownership.

Unicode A standard that assigns a unique number to every character, regardless of

language or the operating system used to display the language.

URL Uniform Resource Locator. The address of a computer, file, or resource that can be

accessed on a local network or the Internet. The URL is made up of the name of the

protocol needed to access the resource, a domain name that identifies a specific

computer on the Internet, and a hierarchical description of a file location on the

computer.

USB Universal Serial Bus. A standard for communicating between a computer and

external peripherals using an inexpensive direct-connect cable.

user name The long name for a user, sometimes referred to as the user’s “real” name.

See also short name.

user profile The set of personal desktop and preference settings that Windows saves

for a user and applies each time the user logs in.

virtual user An alternate email address (short name) for a user. Similar to an alias, but

it involves creating another user account.

VPN Virtual Private Network. A network that uses encryption and other technologies

to provide secure communications over a public network, typically the Internet. VPNs

are generally cheaper than real private networks using private lines but rely on having

the same encryption system at both ends. The encryption may be performed by

firewall software or by routers.

WebDAV Web-based Distributed Authoring and Versioning. A live authoring

environment that allows client users to check out webpages, make changes, and then

check the pages back in while a site is running.

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Apple Mac OS X Server Print Service Administration For Version 10.4 or Later Manual do Utilizador Página 226