How do I use the Event driven system to...

[Douglas Phillipson <dougp intermind net>]

Ive gotten to know and use GTK pretty well so far, but I haven't seen 
how to do things that aren't event driven.  For example, how would one 
monitor the serial port or uSB port for incomming data to display on the 
graphics area as it comes in.  Can I somehow attach a GTK event to the 
serial port and get dropped in a callback routine to grab data when I 
see a byte?  I don't need to know how to monitor the serial port, I can 
do that already but if GTK sits in an event loop, how do you get input 
from non GTK stuff to use and display with GTK?

Thanks

Doug P