Load the ``vax", ``source", ``toppar", and ``tutorial" directories. Go into VAX directory and modify ``login.com" according to your directory structure. Execute ``login.com". Compile and link ``prexplor.for" by executing ``prexplor make.com". Execute ``install.com" (this will create the X-PLOR object library), and then compile the source and link the executable. To modify dimensions, edit file ``prexplor.dim" and recompile and link everything (use ``compile.com" and ``link.com"). Machine-dependent routines of X-PLOR are in ``vaxtime.s". The precompiler is in ``prexplor.for". To execute the program, type XPLOR. Make sure that you have copied ``vaxtime.s" into the source directory before running the installation procedure. The directory structure and usage are described above.