Echo2 Javadoc
Echo2 is the platform on which Æjaks is built. Since Æjaks is a thin layer on top of Echo2 objects, the Echo2 documentation is useful for further information.
The Echo2 version used in Æjaks is v2.1.1 from Subversion sources (April 1, 2009).
The Echo2 home page at NextApp (and here) also has a number of useful documents, including an FAQ, tutorial, and Technical Overview.