Hi everybody,

I have an understanding problem of how a TCP/IP stack works.

After the IP data where processed and the IP header is removed, the
data packet could be TCP, UDP, or ICMP. At the moment I do not
understand how and where the decission is made. For example if the
data are TCP the message need an acknowledgement.

The same understanding problem I have with the application layer. If I
have running two programs like Firefox or IE where the stack knows
which browser invoked which homepage?

Thank you in advance.

Markus