If you are new to TIS, read the Getting started section, which gives an overview on TIS and gets you started on using the TIS Board. If you want to learn how to develop TIS Solutions, you can do some of the exercises provided in the TIS Training section. If you want to setup and maintain a TIS system, you may be interested in the Deployment page.
The Reference section provides detailed information on the TIS Editor and the TIS Board for TIS developers, on the TIS Admin for user administrators, and the Deployment of the TIS system for technical administrators.
The Glossary contains explanations on the TIS terminology.