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HyperNet (Marovac, 1994) is an authoring and browsing system for the creation and navigation of multimedia documents. It was designed to provide a mechanism for very fast choreographing and configuration of hypermedia documents of arbitrary structure and content. HyperNet features enable a group of users scattered worldwide to compose hypermedia documents from components which exist in a set of world-wide distributed data bases. Two new features in HyperNet are: The first feature, synchronization clauses in HyperNet links, allows for synchronization of multimedia components in hypermedia documents. The second feature, active links, is not commonly found in hypertext machines. These links associate with them extensive computations. Active links add new functionality to HyperNet which includes interface to and browsing of external distributed data bases and interfaces to and execution on demand of computational modules. This new functionality extends the use of HyperNet to new application domains, e.g. decision support systems, group support in cooperative work, interactive database browsing, software development environments, and interactive linking and on demand execution of worldwide distributed reusable modules.