The Free On-line Dictionary of Computing (30 December 2018):

Program Composition Notation

   (PCN) A specification language for parallelism between C and
   Fortran modules.  PCN provides a simple language for
   specifying concurrent algorithms, interfaces to Fortran
   and C, a portable toolkit that allows applications to be
   developed on a workstation or small parallel computer and
   run unchanged on supercomputers and integrated debugging and
   performance analysis tools.  PCN was developed at Argonne
   National Laboratory and the California Institute of
   Technology.  It has been used to develop a wide variety of
   applications, in areas such as climate modelling, fluid
   dynamics, computational biology, chemistry, and circuit
   simulation.

   Version 2.0 runs on networks of workstations: Sun-4, NeXT,
   RS/6000, SGI; multicomputers: iPSC/860, Touchstone
   DELTA; and shared memory multiprocessors:
   Symmetry/Dynix.

   (ftp://info.mcs.anl.gov/pub/pcn).

   E-mail: Ian Foster , Steve Tuecke
   .

   ["Productive Parallel Programming: The PCN Approach",
   I. Foster et al, Sci Prog 1(1):51-66 (1992)].

   (1993-02-12)