This is gather-scatter software for message passing implementation
of matrix-vector products for domain decomposition based iterative solvers.  
It has a particularly simple interface in which the user provides a list 
of global indices in a preprocessing phase, followed by the vectors to
be summed (the gather-scatter operation) in subsequent execution steps.
The package can be called from C or Fortran and supports either the Intel 
NX or MPI message passing protocols.   C and Fortran example drivers and 
makefiles are provided.

Code developed by Henry Tufo and Paul Fischer with support from the NSF 
under Grant ASC-9405403 and the AFOSR under Grant F49620-95-1-0074.