Hi Robert,

maybe I must tell you a little bit more about my motivation.

I have to do a presentation about APIs. I want to show APIs in stack
programming. I want to show my colleges that a SAP (Service Acces
Point) does not change the behaviour of a stack if it is correct
programmed. Unfortenately everthing what I say I have to demonstrate.
To reach my aim I was thinking that I show them that I add a SAP
between IP and TCP layer under Linux. At the moment I am not really
sure if this approach is a good one.

They do not have the background knowledge of IP/TCP.

I will take a look in socket progamming but I was thinking it is
easier.

Thank you,
Markus