Java
A programming language developed by Sun Microsystems which allows real time updates of Web pages & incorporates many dynamic features, such as the use of applets. You need java installed to use mc² chat. You can check if your computer is Java-enabled. If required, you can Download Java from java.com

Javascript
Despite it's name, JavaScript really doesn't have anything to do with Java. JavaScript is also a programming language, but it's a much simpler one. Check if your computer is Javascript-enabled. See also: Writing basic JavaScript

JPG / JPEG
Images used on Web pages are usually in jpg or gif format. jpg files are compressed and generally used for photographs. See Images

JAWS
A screen reading software product. JAWS reads information from the computer screen out loud, thus providing access to software applications and the Internet, for those with vision impairment. JAWS also outputs to refreshable Braille displays. See JAWS (Freedom Scientific site)