[mythtv-users] Recording LED light possible?

[mark]

I'm one of those folks using a separate satellite box 
for a tuner, and have Myth changing channels when a 
show is recorded.  The thing is though, the rest of the 
family isn't always using Myth, and sometimes they
come along and change the satellite channel without
going into Myth and determining if a program is being 
recorded.  I know this was discussed in the past, but
has anyone a good idea of how to code an LED 
during recording?  The hardware side of things is trivial,
as it's nothing to turn on an LED from a serial or parallel 
port, but the software side of it is daunting.  Anyone make
any progress on this?  

Regards,
Mark