According to torellip@arena.sci.univr.it:
>
>sorry, but I can't understand why touching the ttys file. I'm trying to
>make computers interact (transfer files, so on), not act as terminal.
>Or, is there something I'm missing?
>

Yes, you are missing something.  The ttys file also tells the system
which ports handle modems and hence need the modem signals paid
attention to.  As I said before, if you arrange things so CD is
asserted when you plug the two ends together then things can be made
pretty much automatic.

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Brett Lymn, Computer Systems Administrator, BAE SYSTEMS
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