Creativyst's Glossary of Industry Related Terms

Industry Terms

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(Creativyst™ Glossary)

Java

An object-oriented programming language developed by Sun Microsystems, Inc. used to create applets that can be distributed over the World Wide Web. Java programs run in a simulated environment called a Java Virtual Machine (JVM). This allows them to be run without modification on any system that has a JVM installed.

Examples of systems with JVMs include palm computers, PDAs, desktop computers, and cell phones.

See Also: API CLI

JavaScript

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A function based, object oriented, interpreted scripting language for web pages that typically runs on internet browsers. It permits web sites to run more interactively and allows a lot of processing to be performed by the local computer running the browser without requiring connection bandwidth, or server resources.

Some of the tasks this language is typically used for on web pages include verifying form fields before submitting them over the internet, doing clever animations and mouse-over effects, and performing data display liaison functions between dynamic server side applications and static pages (i.e. news headliners, etc.).

JavaScript was developed and named by Netscape in 1996 for use in the 2.0 version of their browser. It has since been endorsed as an official, open standard named ECMAScript, by the ECMA.

Though it is most commonly used as a browser side scripting language (i.e. run on the browser of local machines viewing the web page), JavaScript has also been defined for use as a server side scripting language. In this capacity it works like other server side scripting languages like Perl, Visual Basic, and PHP.

Note: JavaScript is not Java. The similarity in name (and structure) is purely coincidental.

Jitter

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Or "network jitter" -- describes the VARIATION in the time it takes subsequent data packets to arrive over a network. For most types of data large variations between arrival times are acceptable. For networks that carry voice or video relatively small differences in arrival times cause perceptible disturbances in the recreated voice or video at the receiving end.

Because packet routing protocols such as IP generally rely on shared access to common transmission media (e.g. many asynchronous processes all sharing the same physical line) they tend to be characterized by relatively high jitter.

Jitter can be reduced with buffers. Buffering some incoming packets and then outputting them at a more regular rate reduces jitter. This is fine for data streams that are not interactive. For interactive streams such as two-way phone conversations, this scheme will add latency, which reduces the quality of the conversation.

See Also: QoS Latency

Joint Technical Committee

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	See: JTC

JSMsg

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JavaScript Messaging Convention - A syndication format that allows dynamic content to be displayed on web sites using only client-side scripting.

JSMsg is primarily a complimentary convention providing content that has traditionally been shared in RSS format. The ability to display RSS dynamically on websites is only available to webmasters who can install and run server-side scripts.

JSMsg's fills the void by making content available to the millions of novice and weekend webmasters who run personal interest and family sites on free server space provided by their ISP's. This space typically limits the scripts they can install to those supported by the browser, disallowing any server scripts.

JSMsg files convey dynamic content in client-side JavaScript. They also include the access methods required to retrieve or display their own content.

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