RUN201.DOC
                                      from
                          Horn Engineering Associates
                              (No Rights Reserved)
        -----------------------------------------------------------------
                                +++ CAUTION +++
                               -----------------
        Previous versions of RUN, which might have been  called  RUN  or
        RUN2,  contained a serious error in the assembler computation of
        the address where the  target  program  loader  is  placed.  The
        intended  location  was  just  below  the  CCP, but as coded the
        loader would most likely be placed somewhere in the BIOS on most
        systems.    This problem was not detected on the author's system
        because the program appeared to work properly.    This  bug  has
        been  blamed  for  recent  mysterious  system crashes.  The .ASM
        source code for RUN201 contains a notation  in  the  code  where
        corrections  for  this  bug  are  to be found.  We offer sincere
        apologies to anyone who has been inconvenienced by this fault in
        previous versions.
                                                            Charles Horn
        ----------------------------------------------------------------
        RUN, Version 2.01,  is  a  variation  of  the  original  RUNFILE
        program  by  Phil Cary.  That program was designed for use on an
        RBBS and permits one  to  execute  a  selected  program  from  a
        selected  high  user  area, even though the file is not normally
        accessible to the user or caller. With this technique, the  file
        can be executed without alteration of the wheel byte.

        RUN is somewhat different.  RUNFILE  loads  the  program  loader
        just  below  the BDOS and over a portion of the CCP.  This is no
        problem if the executed program (such  as  RBBS)  exits  with  a
        warmboot,  which  reloads  the CCP.  However, some programs exit
        directly to CP/M without a warmboot (such as SD.COM).  If it  is
        allowed to do this when called from RUNFILE, the CCP will remain
        corrupt.  RUN solves this problem by locating the program loader
        just below the CCP.

        RUN requires specification of a file name in the  command  line.
        This  can  be  at  least  as  secure  as an 8-character password
        because the file in the high user area can be named anything and
        will not be accessible for view by directory if the BBS does not
        normally permit a user to access these high areas.  This is  the
        purpose of MAXUSR and MAXDRV in the various RBBS utilities, such
        as NZCPR.

        The command syntax is: A>RUN <filename>

        The program will also support the usual command line  extensions
        if  the  target  program  normally  extracts  them from the CP/M
        default DMA area.  For example, RUN SD $A would work.  RUN SD B:
        $A  would  not work because the extra $A entry would clobber the
        CP/M secondary FCB.  However, the variation RUN  B:SD  $A  would
        cause  the  target  file,  SD  in user 14, for example, to go to
        drive B: and display all files in all user areas.  This  program
        also  offers  an  option  to build the target file name into the
        program so that it will operate in the same mode as the  RUNFILE
        program.  In this case the command would simply be "RUN".

        Charles Horn
        11 June 1985