The first demo expert system we will run is intended to show you how EXSYS
asks questions, how the user can ask the program about how information was 
derived and why questions are being asked.  For this first demo, you WILL NOT
need to provide actual input.  A window will appear after a brief pause to
explain what the program is doing and what input the program will provide.
Read the text in the window.  When you are finished with the window, press
any key ONCE.  The window will disappear and you will again be able to read
the screen underneath. (You may not have had time to fully read the screen
before the window appeared). When you are ready for the program to provide
its input, PRESS ANY KEY AGAIN.  The program will provide the input and
continue its execution of the commands.

Once you are finished with this introduction to using EXSYS, you will be 
given the opportunity to run several expert systems yourself.