NOAH'S ARK SPECIAL FEATURES

  - RAM free flag will change to a more intense color when free RAM < 100K.
  - Bytes free on disk indicator will flash if bytes free < .5*(Marked Bytes)
     in order to alert you to the possibility that PKZIP will run out of disk
     space.  PKZIP writes a temporary file.  Redirect with SET command.
  - When you invoke a CUSTOM command NOAH displays free RAM so that you may
     rule out an "insufficient memory" error.
  - NOAH will warn you prior to PKZIP command execution when the available
     RAM is certainly insufficient.
  - NOAH will not allow you to run ARKSETUP from within the shell if there is
     not enough RAM to do so.  This avoids a possible system lockup.
  - The STATUS box gives ad hoc estimates of the PKZIP filesize at 50% and
     75% compression.  These are NOT computed figures based upon an
     algorithm. (Yet)
  - Confirmation of deletions, and will delete read-only files.
  - Confirmation of file overwrites on any copy/move call.
  - Marker retention ACROSS drives & directories.  Duplicates BY NAME will
     remain marked.
  - ERROR marking if PKZIP reports an error condition while working with a
     file.  Permits safe unattended operation with remedial action.
  - Full PKZIP error and event trapping with dialog boxes.
  - Multiple file mark levels.

