Front Page Applet ATSQL UC TUC SEQ NSEQ System Guidelines Requirements Doc Support Information Contribution Warranty Related Work Contact Future Work | Tiger is an advanced temporal database system. Salient features are an enhanced support for the time through ATSQL, the intelligent resue of existing database technology, a seamless extension of database systems with external modules, and an applet interface that supports distant learning. Implementation-wise, Tiger is realized as a layer to a relational database system. Tiger systematically enhances the database system with temporal functionalty. Whenever feasible the data processing is delegated to the database system. However, if functionality and efficiency concerns make the processing by the database system inappropriate external modules are used instead. External modules seamlessly extend the functionalty of the database system. They take care of advanced temporal functionalty such as coalescing, temporal aggregation, and temporal difference. To support distance learning Tiger is accessible over the internet. Through a standard browser a java applet can be invoked. The applet displays a bookshelf that contains several books. Each book consists of several sections and pages and discusses selected features of ATSQL. Navigation within the bookshelf is possible via a tree or control panel. The input window displays the current page, which can be modified by the user. It is possible to execute (a selected part of) the current page. The result of an execution is displayed in the output window.