At a Unix Terminal

  Load a large file range.tar.Z
  to a convenient directory location.  Enter that directory
  by giving the appropriate unix command.

  The unix commands
      uncompress range.tar
      tar xf range.tar
  decompose the file range.tar.Z into its component files
  which are held in a new subdirectory: range

  In the range subdirectory, there are a number of .h and .cc files,
  the TeX language description file describe.tex,
  and also a makefile for creating executable files.

  Enter the range subdirectory by the unix command 
      cd range
  
  If  your unix system has the Free Software Foundation's 
  C++ compiler available, then the unix command
      make
  will constuct executable versions of all the demo programs.
  If your unix system has some other C++ compiler,
  you will need to change the beginning lines of the makefile
  that define the various compiler commands,
  so that the make command works correctly with your compiler. 

  After make executes, you can use the unix command 
      problem
  to call any of the demo programs.