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OPENFILES - Unit to show list of open files.

    Written by D.J. Murdoch for the public domain.

    This unit interfaces three routines, which look in the
    (undocumented) DOS list of open files for the filenames.  One
    routine prints a list of open files, another returns the list in a
    collection of strings, and the third calls a user routine once for
    each open file.  If compiled for DOS, it automatically installs an
    exit handler to call the print routine, so if your program bombs
    because it runs out of file handles, you'll see the list of what's

    Not all versions of TP support collections of strings, and not all
    users of those that do install the Objects unit, so I've added a
    conditional compilation symbol "Collections" which can be used to
    control the inclusion of the object-oriented code.

    For details of parameters etc., see the source code OPENFILES.PAS or
    the sample program TEST.PAS.

    I've tested this unit in TP 6, BP 7 (all modes), TPW 1.5, MSDOS 3.2,
    4.01, 5 and 6; it should work in the other DOS versions from 2 to 6,
    but I'd like to hear from you if it doesn't.

    Fidonet:   DJ Murdoch at 1:249/99.5
    Internet:  dmurdoch@mast.queensu.ca
    CIS:       71631,122

      1. 21 Oct 91  - First release to PDN echo.
      2. 26 Oct 91  - Added check of PSP segment, and DOS 3.0 record
                      format. Set Allfiles to true to get previous
      3. 24 Jun 93  - Added DOS 6 and DPMI support
      4. 24 Aug 94  - Added BP 7 Windows support, a bit more flexibility
                      in ways to call
      5. 29 Aug 94  - Added conditional Collections, added PSPseg to
                      information passed to for_each_open_file action