Re: JD...
  By: John Dailey to Stephen Hurd on Tue Mar 23 2004 10:01:00

 >  SH> In fact, every door I've ported to date uses stdio... then HUP signals
 >  SH> for carrier detection. I have added sockets support to OpenDoors,
 >  SH> but I  don't use the stuff... there's no point.
 > 
 > Pardon my ignorance, but "HUP signals?"

A signal can be thought of as a programmable software interrupt... a HUP signal
(For Hang UP) is a "User has disconnected" interrupt.
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