Apple QuickTime Technical Information download pdf (Page 75)

Glossary 75

multicast In general, the simultaneous transmission of a message to a specific subset

of computers on a network. See also broadcast, unicast. In QuickTime streaming, an

efficient, one-to-many form of streaming. Users can join or leave a multicast but cannot

otherwise interact with it.

multihoming The ability to support multiple network connections. When more than

one connection is available, Mac OS X selects the best connection according to the

order specified in Network preferences.

NAT Network Address Translation. A method of connecting multiple computers to the

Internet (or any other IP network) using one IP address. NAT converts the IP addresses

you assign to computers on your private, internal network into one legitimate IP

address for Internet communications.

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.

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 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 data packets are allowed to traverse a local network. “Port” usually refers to

either a TCP or UDP port.

privileges The right to access restricted areas of a system or perform certain tasks

(such as management tasks) in the system.

progressive download Movie data that’s pushed via HTTP to the client. The movie can

be viewed by the user as it is being transferred. This isn’t 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 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.

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Apple QuickTime Technical Information Page 75