Even more fancy things : Dictionaries
You are unlikely to need to use a Dictionary. The only example I have used it for until now is passing parameters from the Server version into a Graph.
A Dictionary is essentially a shared memory space that two isolated Java applications can use to share common data. In the case of a parameter being passed to the Clover Server on the querystring, the one Java application is the Tomcat Server and the other is the Clover Server itself.
If you feel you may need more information on Dictionaries, please contact email@example.com.