The two drivers interp and interp1 are demonstrated in the include/bin
subdirectory.  Invoke "interpdemo" to see a full solution in action.
You will notice that the C driver called interp.c is a little more general
than interp.t.  The reason for that is that because OOT is interpreted,
it's almost as easy to change the code as it is to have the program ask
you for responses.