It turns out that when you're mobile, some daemons don't behave
   properly, so another thing this script might do is to shut down
   some daemons and restart them when the IP address changes.

An idea which has occurred to me was to add a new signal,
SIGIFCH, analogous to SIGWINCH, which is delivered to user
processes expressing interest in it when the "local address set" of a
system changes.

					- Bill