srmcode.tar.Z has the simulator code itself.  There is NO supporting
  documentation.  I had the code in ~/paper/srm/sims/src.
testcode.tar.Z contains the acceptance tests.  This was in
  ~/paper/srm/sims/tests.
simcode.tar.Z contains supporting files for running simulations.
  Some of these supporting files are needed for the acceptance tests.

To run acceptance tests, use the file tests.com from testcode.tar.Z.

THIS CODE IS NOT SUPPORTED.

This code is in the process of being incorporated 
by Puneet Sharma (puneetsh@catarina.usc.edu) and 
Kannan Varadhan (kannan@central.cis.upenn.edu)
into the ns simulator (http://www-mash.cs.berkeley.edu/ns/).