Borland's Overlay Profiler (OVRPROF)
------------------------------------

  Since certain overlaid programs don't work well with the virtual DOS
  profiler (TF386) and TPROF.EXE doesn't have the capacity to load large
  programs, we have created a stand-alone overlay profiler.  OVRPROF is
  basicly two .OBJ files that hook into a special function in the
  overlay manager that notifies OVRPROF when a module is loaded.
  OVRPROF then uses your program's detailed .MAP file to derrive the
  name of the module.  This information is recorded in a collection that
  keeps track of:

    Module name
    Segment Address
    Count (number of times the module was loaded)
    Current DOS 18.2 timer tic value (for chronology)

  There are two DOS environment variables that control the way that
  OVRPROF works:

    OVRPROF=           {output file or device}
    OVRPROFALL=        {Y for printing all data}

  By default, the output is sent to stdout.  By specifying a file or
  device name to the OVRPROF= variable, the output will be directed
  there.

  The output file contains either one or three parts (depending on the
  options set).

  The default section is printed out at the end of the program, and
  contains the accumulated statistics on all the overlaid modules.  If a
  module wasn't called, then it's count value will be zero.

  If OVRPROFALL= is set to 'Y', then the modules are logged out as they
  are read in from the .MAP file, and also as they are called by the
  overlay manager.  This allows the chronology to be kept intact.  Also
  the elapsed number of tics between module loads are displayed.

  **WARNING** Do not attempt to overlay OVRPROF.OBJ or OVRHLP.OBJ, they
  must both be resident modules.

  To use, simply link with both modules (OVRPROF.OBJ & OVRHLP.OBJ), and
  tell TLINK to generate a detailed map file (/S).