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      STACKER NOTE                                         STACKER NOTE
                        ANTI-VIRUS PROGRAMS & STACKER
                          (Applies to Stacker 4.0)
      STAC FAX  4413 (09-21-1994)
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      BACKGROUND
      
      Stacker is compatible with anti-virus programs such as those from
      Norton (NAV) and Central Point (CPAV).  This document will
      provide you with information on how Stacker and anti-virus
      programs coexist.
      
      SOLUTION
      
         - Installing Stacker.
         - Immunization.
         - BOOTSAFE from Central Point Anti-Virus.
           
      Installing Stacker
      
      Anti-virus programs may be run from a command line, a menu,
      whenever the system boots, and/or as a memory resident program.
      Stacker Setup will detect and disable most Anti-Virus programs
      that run at startup or are memory resident. When Stacker Setup
      asks you if you wish to restart to disable memory-resident
      programs, choose restart.
      
      Immunization
      
      Some anti-virus programs such as CPAV allow you to "immunize"
      executable files by adding signature information to the file. Do
      NOT immunize the Stacker device driver files.  These files use
      their own signature information for a "checksum" self-check at
      boot time. Immunizing the files disrupts this checksum
      information and prevents them from loading.  Exempt the files
      from immunization by adding them to the immunization exception
      list.  Add the following files:
      
      DBLSPACE.BIN if you are using DOS 6 or above.
      STACKER.COM and SSWAP.COM if you are using other DOS versions.
      
      If you must restore the DBLSPACE.BIN file, switch to your STACKER
      directory and type: REDBL C: <enter>.
      If you must restore the STACKER.COM and SSWAP.COM files, copy
      them from the \STACKER directory on the Stacker CD-ROM to the STACKER
      directory on the hard drive.
      
      BOOTSAFE from Central Point Anti-Virus.
      
      Bootsafe is Central Point's partition table and boot sector
      security system. Usually loaded in AUTOEXEC.BAT, it examines the
      boot sector and partition information of the default drive
      (usually C:).  If Stacker is swapping drive letters, Bootsafe
      will attempt to read this information on the Stacker logical
      drive and report: "WARNING partition/boot sector has been
      modified!"  This solution is to make Bootsafe look at the
      uncompressed (physical) boot drive. To determine the uncompressed
      boot drive, type  C:\STACKER\STACKER <enter>.  The Drive Map
      display will be similar to the following:
      
      Drive C: was drive C: at boot time  [ D:\STACVOL.DSK = 123.4MB ]
      Drive D: was drive D: at boot time
      
      Note the drive letter in brackets next to drive C (D in this
      case). This is the uncompressed boot drive. Therefore, in
      AUTOEXEC.BAT the Bootsafe line would be:  Bootsafe D:
      
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      Copyright 1994 Stac Electronics
