nullmodem - a Utility to loopback Pseudo-Terminals

for more information look at the WWW-Page
  http://www.ant.uni-bremen.de/whomes/rinas/nullmodem/index.html
  
or at the local copy included in this package (directory html).


There is also a man page for nullmodem.

  Juergen Rinas <jrinas@gmx.de>
