Offsiders are persistent, object-like entities that can be accessed from the command line. They provide natural and intuitive object-oriented capability to UNIX systems and environments. Methods can be written using any programminglanguage.
The XPS is a scalable platform for meta-programming and domain engineering. It provides a virtual machine, compiler, and runtime library that make it possible to efficiently develop, debug, and run programs based on XPL (eXtensible ProgrammingLanguage)