The inclusion of a Java interpreter allows for dynamic elements such as animations and live information updating to also appear in-line. In addition to these major technical and architectural changes described, Netscape 2.0 adds a feature called Frames. Frames are primarily a graphic design and user interaction enhancement. These multiple rectangular page areas can be scrolled independently and can also independently submit queries and display results. Static areas for such things as button bars and tables of contents are called Ledges.
Ledges can also solve an interesting problem faced by Web advertisers.
You are probably familiar with those oftenannoying rectangular graphic ads on the tops and bottoms of web pages. A Web site can place an ad in a Ledge and it will just sit there, not interfering with the rest of the everchanging document. Infoseek and Web searching service has begun to do this. As this book was nearing completion, new versions of Netscape were being betatested. The previous Back behavior was an annoying user interface change.