The IMP Shell is a powerful expert system development environment for
 the IBM PC.  It contains all the utilities needed to develop and test
 new expert  systems,  and run  them  when  they  are  finalized.  All
 functions are menu driven and appear in windows.   IMP expert systems
 are rule based,  backwards chaining systems.   They are very fast and
 not limited by an artificially small number of rules.
 
 The IMP Shell is in the public domain and is used in many educational
 settings.  It was developed  by Daniel H. Marcellus of the Middletown
 Programming Works, Middletown, N.Y.  It is described in his new book:
 Expert Systems Programming in TURBO PROLOG, Prentice-Hall, 1987.
 
 The IMP Shell requires DOS 2.0  or later and 512K of  memory.  It can
 run from a single disk of any sort.
 
 There is an extensive help and tutorial  facility  available from the
 main menu.  There is a large example in the file impshell.rul.  It is
 an investment advisor.  It can be loaded from the main menu.
 
 Start the system by typing IMPSHELL.