Over 80 input and output files are provided in the ``test" directory. They can be used to check the correctness of a particular installation, a useful procedure when one is installing X-PLOR on new systems with optimizing FORTRAN compilers. The ``runtests" and ``difftests" procedures should be used before running the test cases; they copy the necessary parameter and topology files from the ``toppar" directory into the ``test" directory.