In relation to documents, there may be additional classification attributes.
These attributes are made up of the so-called "tags" (classification labels) which, if present, are shown in the information screen of the selected document. In other words, tags allow you to trace a document through words not directly present in the documents but which help to identify them.
For operational details on the different search methods, which are very easy and intuitive to use, it is still a good idea to consult the Help page which can be reached from the main menu of the Thesaurus access platform.