Dear Oleg & Jez,

No, this is not a homework, This is a remote equipment that must make a phone call and transfer some data using modem when an "event" occurs. An "event" happens when a logical relationship between some port pins becames "true", and the logical relationship need to be changed remotely at user request; so I am looking for ideas and help about how to implement it in C...

cheers,
JLR