The Poor Man's Line Monitor (PMLM.EXE) is basically of interest
      to developers of comm applications and those providing technical
      support for those applications.  This SIO utility is released
      largely (in self defense) in the hope that some users can
      diagnose their own problems.  PMLM's feature of saving trace
      information to disk will only work with registered and beta
      versions of SIO.

      PMLM provides basic line monitoring for OS/2, DOS and Windows
      comm programs.  All characters sent or received by application
      programs are displayed in the upper portion of the screen. 
      Receive characters are displayed as "white on blue" and
      transmitted characters are displayed "yellow on violet".  Line
      signals, such as CTS are displayed as "dim white on red" when
      turned off and "bright white on red" when turned on.  In
      addition, a signals transition to OFF is displayed in lower case
      and a signals transition to ON is displayed in upper case.

      Status information is displayed in the lower part of the screen. 
      A bright white display means the signal is on, a dim white
      indicates that the signal is off.  In addition, when bright, 
      Rxoff and Txoff indicate the SIO has sent (Txoff) or received
      (Rxoff) an Xoff, and an Xon is pending.

      When a DOS or Windows session uses a comm port, an additional
      line of signal status appears.  This status line shows the state
      of the virtual UART's signals.  Only the signals which MAY be
      different from the real UART's signals are shown.

      "Rx Chars" and "Tx Chars" reflects the number of characters in
      SIO's receive and transmit buffers respectively.

      The last line on the screen shows the keys (from the keyboard)
      that PMLM will recognize.  The bright character shows the key to
      hit for the associated function.  The font keys will not work in
      a windowed OS/2 session.

      PMLM's command line requires one parameter, the comm port number,
      and optionally accepts an additional parameter giving a save
      trace file name.  For example, PMLM 1 COM1INFO.TEC will monitor
      COM1 and save ALL of the communications traffic in the file
      COM1INFO.TRC.  The trace files created by PMLM contain exactly
      the same information that is displayed by PMLM, video attributes
      and all.





      VIEWPMLM.EXE may be used to view trace files created by PMLM. 
      VIEWPMLM.EXE requires one parameter, the trace file name.  The
      user can use the keys UP, DOWN, PAGEUP, PAGEDOWN, HOME, and END
      to navigate the saved trace file.  Registered SIO users may send
      VIEWPMLM.EXE (along with saved trace files) to anyone for
      technical support purposes.

      VIEWPMLM can be used in native DOS, in DOS sessions under OS/2,
      and in OS/2 sessions.  This means that even those developers and
      support people need not have OS/2 to view the captured
      communications data created by PMLM.