plastic. Useful for when plastic reboots, although it needs to be
run from paper of course. We should probably set up some kind of
reboot utility for when plastic reboots, since when capture fires up,
the "acl" files are all in the wrong group/mode. On the other hand,
this shared file based permission scheme is going to end up changing
anyway soon, since it won't work when the serial lines are on other
machines. Will need a tip permserver at that point.