Netscape is a popular WWW browser developed by Netscape Communications Corp. Netscape 1.1 supports some HTML 3.0 features (tables) and has interesting API, that makes it possible to develop

Documents that are formatted using RTF can be transfered to HTML by using a converter RTFtoHTML. It generates HTML document from the original RTF document and a set of picture files if the RTF document contained pictures. In the HTML document links are created to the graphics files. The graphics can be viewed on most environments if pictures are of type GIF.

MetaCard is similar application than HyperCard but it runs in Unix environments. MetaCard offers the ability to create and modify applications using interactive tools and a simple scripting language.

Intrestingly, HyperCard stacks can be imported to MetaCard. However there are some incoptabilities on the HyperTalk and MetaTalk, so advanced stacks dont run without modifications.

The Transitional Mathematics Project at Imperial College London has produced similar Mathematica notebooks to be used in calculus courses. At the end of each notebook there is a set of exercises to be solved with pen and paper and evaluated by the computer. Some feedback is provided for the student ("you got 2 out of 4 correct"). Mathematical formulas are created with a special formula editor and transferred to notebooks as pictures.

This kind of material certainly has its place in the classroom. It offers the capabilities of computer algebra systems to students right from the beginning of their mathematics studies. The disadvantage is that students must learn the material in sequental order; it is not possible to choose an individual order of progress. Apart from the possibility to open and close notebook cells, there are no hypertext features in Mathematica.

Until recently only a few courses in mathematics have been implemented as hypertext. One example is "A Simple Introduction to Numerical Analysis". The material is published on a CD-ROM that contains the hypertext material, animations and graphical tools. Another interesting course is a hypertext version of "Introduction to Algorithms". This CD-ROM contains hypertext, several animations and QuickTime movies. These high-quality texts and animations add a new dimension to learning mathematics. To see a sorting algorithm in action gives the user a mental reference or orientation basis to which to relate the theory and implementation of that algorithm.

However, there is a problem related to the way the material is put together. For the reader the material seems to be a collection of cards or stacks that do not form an entity. This problem is partly due to a limitation in HyperCard; HyperCard is not able to treat mathematical formulas as written text. That is why they must be transferred as pictures. HyperCard can present pictures and text only on cards, not on scrollable text fields. The card itself is not in a scrollable window and only one card can be visible at a time. As a result, when a new card is turned on, all the previous information disappears with the old card.