Apple QuickTime Streaming Server (Administrator’s Guide) - Manual (Page 73)

Glossary 73
N, O
NAT (Network Address Translation) A technique sometimes used so that multiple
computers can share a single IP address.
open source A term for the cooperative development of software by the Internet
community. The basic principle is to involve as many people as possible in writing and
debugging code by publishing the source code and encouraging the formation of a large
community of developers who will submit modifications and enhancements.
P
packet A unit of data information consisting of header, information, error detection, and
trailer records. QTSS uses TCP, UDP, and IP packets to communicate with streaming clients.
pixel
A single dot in a graphic image with a given color and brightness value.
playlist
A set of media files in the QTSS or DSS media folder specified to play one after the
other or in random sequence.
port A sort of virtual mail slot. A server uses port numbers to determine which application
should receive data packets. Firewalls use port numbers to determine whether or not data
packets are allowed to traverse a local network. "Port" usually refers to either a TCP or UDP
port.
privileges
Settings that define the kind of access users have to shared items. You can
assign four types of privileges to a share point, folder, or file: read and write, read only, write
only, and none (no access).
progressive download Movie data that is pushed via HTTP to the client. The movie can
be viewed by the user as it is being transferred. This is not a form of media streaming.
protocol
A set of rules that determines how data is sent back and forth between two
applications.
proxy server A server that sits between a client and server and negotiates communication
between those two hosts. The client and server only communicate with the proxy server and
never interact with each other. There are proxy applications for many network protocols,
including HTTP (for web traffic) and RTSP (for streaming traffic).
Q
qtaccess The name of the plain text access file that contains information about users and
groups who are authorized to view media in the directory in which the access file is stored.
QTSS (QuickTime Streaming Server) A technology that lets you deliver media over the
Internet in real time.
QuickTime
A set of Macintosh system extensions or a Windows dynamic-link library that
supports the composition and playing of movies.
LL0329.book Page 73 Wednesday, November 20, 2002 2:09 PM