How can I write a file transfer program like ICQ?

Hello, I had written a simple file transfer program,
but I want it to have the functionality like the ICQ file transfer program,
that is, after disconnection, it can resume the transfer last time when re-connect again.

Is there anyone who can help me?

Thanks very much

Pauline.

Hi Pauline,
have a look at this address, there is a hot programmer called Karl Moore who has done a lot of the work for you.
http://www.vb-world.net/internet/winsock/