hooks and callbacks

Ive read definitions of both of these and I just dont have a clear idea of what they are. What I think they are is:

hook: replacing an interface function with your own function to change the functionality of an interface

callback: putting a function call inside a function call so when you call a function it calls your function that you gave it

is this right?

>>16
I am not sure what you mean, there is no networking involved, only the serial port.

What i need is a program that emulates an ANSI terminal inside my VT(XFCE terminal) and connected to the other side using serial cable to a computer.

I need something like telnet, but instead of using the TCP/IP i want to use a serial port.