Other common errors 
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  DOS open error 4

  This is a DOS error that indicates there are no more handles left to
  open another file.  Increase the number of file handles in each of
  three places:

  o The workstation - FILES=nn in CONFIG.SYS
  o The network - (SHELL.CFG for Novell)
  o The program - some C compilers limit the number of file handles in
    the start-up routine.

  Remember that Blinker requires one file handle per overlay: one for an
  internal overlay or when using external overlays one per SECTION INTO
  command. Also, Clipper 5.01 requires a corresponding number of file
  handles for the dynamic paging system.

  DOS open error 5

  Particularly for DOS 4.0 and 5.0 where SHARE is automatically loaded,
  a fixed sized table is allocated that will contain the file name and
  full path for each open file.  This error often indicates that there
  is no more room in this table to open another file. In this case,
  execute the DOS SHARE command with an enlarged space for the /f
  parameter.

  Sharing Violation

  Certain networks including 3COM and LANTASTIC encounter sharing
  violation errors with internal overlays when a second copy of the
  program is loaded.  This appears to be due to the network requiring
  exclusive write access to the program file when it loads it.

  To circumvent this problem either set the .EXE to READONLY access by
  using the Blinker command READONLY, (or the DOS utility, ATTRIB.EXE),
  or specify an external overlay with the Blinker command SECTION INTO
  at the start of the BEGINAREA in the script file.

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