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                   What's new in screen-4.0.0 ?
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* new screenrc parser, not 100% compatible.

* screenblanker support: new 'idle', 'blanker', 'blankerprg'
  commands.

* zmodem support via the 'zmodem' command.

* nonblock code rewritten, nonblock now understands a timeout.
  new command 'defnonblock'.