These are codes involving dynamic, pointer-based data structures.  Here's
a quick summary:

  1. bh.tar.Z -- Barnes-Hut N-Body simulation program, in C.

  2. sm.tar.Z --  Sparse Matrix program, in C, which builds a large and random
     sparse matrix, and then scales, factors, and solves the matrix.

  3. sm-par.tar.Z -- same as sm.tar.Z, except contains explicit parallelism
     appropriate for a Sequent Symmetry multiprocessor.
 
