In particular, we have designed and implemented the Tj distributed object model on top of the CodA meta-architecture. The resultant system supports the description of typical object behaviours (e.g., message sending and method execution) as well as a wide range of distributed object behaviours such as replication and migration.
We have developed a number of diverse distributed applications which exploit the environment's distributed processing capabilities. Our experience shows that this environment as a whole aids significantly in the understanding and design of distributed systems.
Tj is implemented in Smalltalk on top of the CodA object system. It currently runs in a distributed memory environments such as clusters of workstations (using MPI messaging) and the Fujitsu AP1000, a Sparc-based MPP machine with upto 1024 independent processors.
Several documents describing Tj and related projects are available on-line. Note that an overview of its design can be found in a paper on CodA (108KB) to appear in ECOOP '95.