This is the unit that deals with actual storage of documents (text, audio, video, references to links, etc.). All core information, information added by users and logs of interactions are stored here. Though we have used a simple, flat file system with Unix directory structures to store documents, it is possible to use commercial database servers as well. Such a database would provide better indexing capabilities and also allow construction of optimal query scripts for the CGI processing unit. Dynamic modifications are needed in this repository not only to add new information but also to reorganize from time to time the ``intellectual index'' and referencing information.