how to connect to a computer of different domain

How to connect to a computer of different domain?
and how to do if the target computer is in a different workgroup?

What do you mean by connect? What do you want to do?

I want to copy from one computer to another computer in a different computer. how to do?
thank you

Are you developing a (1)VB application or is this a (2)general Windows question?

(1) You could write a client/server application that enables you to do what you want.

(2)You could use VPN to establish a connection to the other network. Then the other network would appear as part of the LAN you are connected to. To do file transfers, you would need to access 'shared' resources.

Cheers,
Nap