CHECK4 is distributed in one of two ARChive files ... 
     CK4CMD.ARC - containing the executable programs and documentation
     CK4BAS.ARC - containing the BAS and ASM source files and documentation

The following are the files and their discription in the two ARChives:

                                 CK4CMD.ARC
   CK4/CMD      A opening banner and loader program
   CK4MAIN/CMD  The main module of the program for data entry, etc.
   CK4SORT/CMD  The sort module, called from CK4MAIN 
   CK4CAT/CMD   The category maintenance module, maintains CKBEXP/DAT
   CK4/DOC      The documentation file
   BASRUN/CMD   Runtime support for the compiled programs
   HISTORY      The revision history of the Model 4 version of the program
   README       This file

                                  CK4BAS.ARC
   CK4/ASM      The assembly source code for the banner/loader.  This program
                shouldn't be used if CK4 is run in interpretive BASIC
   CK4MAIN/BAS  The source code for CK4MAIN, intended to be compiled with
                BASCOM, but can be run in Model 4 BASIC with very minor changes
   CK4SORT/BAS  The source for the sort module
   CK4CAT/BAS   The source for the category maintenance module
   CK4/DOC      The documentation file
   CHECK4/DOA   An Allwrite source file for CK4/DOC
   HISTORY      The revision history of the Model 4 version of the program
   README       This file
