See the Orca project page.
Orca is a language for parallel programming on distributed systems, based on the shared data-object model. This model is a simple and portable form of object-based distributed shared memory.
The Orca implementation on the DAS machine is based on Panda. Orca programs are compiled by (/usr/local/bin/)oc_panda. This compile script supports the full range of architectural options known to the Panda compile script panc. The options -O, -O1, -O2, ... are treated specially. When one of these options is specified, optimized versions of Orca RTS and Panda libraries are linked into the program. When no -O* option is specified, debugging libraries (with symbol table support, assertions etc) are linked into the program.