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Glossary 295
presets Initial default attributes you specify for new accounts you create using
Workgroup Manager. You can use presets only during account creation.
primary group A user’s default group. The file system uses the ID of the primary group
when a user accesses a file he or she doesn’t own.
primary group ID A unique number that identifies a primary group.
print queue An orderly waiting area where print jobs wait until a printer is available.
The print service in Mac OS X Server uses print queues on the server to facilitate
management.
privileges The right to access restricted areas of a system or perform certain tasks
(such as management tasks) in the system.
proxy server A server that sits between a client application, such as a web browser,
and a real server. The proxy server intercepts all requests to the real server to see if it
can fulfill the requests itself. If not, it forwards the request to the real server.
QTSS QuickTime Streaming Server. A technology that lets you deliver media over the
Internet in real time.
realm General term with multiple applications. See WebDAV realm, Kerberos realm.
relay In QuickTime Streaming Server, a relay receives an incoming stream and then
forwards that stream to one or more streaming servers. Relays can reduce Internet
bandwidth consumption and are useful for broadcasts with numerous viewers in
different locations. In Internet mail terms, a relay is a mail SMTP server that sends
incoming mail to another SMTP server, but not to its final destination.
relay point See open relay.
RTP Real-Time Transport Protocol. An end-to-end network-transport protocol suitable
for applications transmitting real-time data (such as audio, video, or simulation data)
over multicast or unicast network services.
RTSP Real-Time Streaming Protocol. An application-level protocol for controlling the
delivery of data with real-time properties. RTSP provides an extensible framework to
enable controlled, on-demand delivery of real-time data, such as audio and video.
Sources of data can include both live data feeds and stored clips.
scope A group of services. A scope can be a logical grouping of computers, such as all
computers used by the production department, or a physical grouping, such as all
computers located on the first floor. You can define a scope as part or all of your
network.