BlockComm and Chameleon.

p4 is one of the ``machines'' on which Bill Gropp's Chameleon system [11] runs. Thus it is possible to run a program that has been coded for the Intel iPSC/860, say, and run it on a workstation network using p4, without changing source code. Chameleon is the foundation for the BlockComm communication library [10], which allows users to avoid explicit construction of messages when the messages consist of matrix subblocks.