Gamess is install on Seawulf under /usr/local/pkg/gamess.

It uses DDI (Distributed Data Interface) for parallelization.
Currently it can only run on a single node on Seawulf (use 1 or 2 CPUs).
Get it running through MPI is possible, but requires some work. It may come in furture.

To run Gamess, please follow the documents at http://www.msg.ameslab.gov/GAMESS/documentation.html .
A simple example script can be found at /usr/local/pkg/gamess/script .