>My client has asked me to do a feasibility study on transferring files between 2 PC via the internet.
>
>I would like your input on:
>- What is the best method to transfer files? (E-mail, FTP, etc.)
>- What tool is best suited for this task? (ActiveX from MS, 3-party tool, etc.)
>- When one PC receive a file, it may have some file to send to the sender. How it can be implemented?
>- How an application can retreive the files when it's received?
>- Hardware consideration?
>- This fonctionality must be implemented as a COM to be integrated in other applications. Any gotchas?
>
>TIA

You need code to run when a file shows up?

If you have a server that can host it, you might want to look at MSMQ. You can use it to send any kind of message including files, and delivery is guaranteed. You can then write COM objects to act when a message is received.

If all you need is simple file transfer, plain FTP will do the trick. wwIPStuff is quick, painless, and cheap.