Inet.url string problem

For enter my internet connection (LAN) usually I can type username, password and domain. If I try to execute same connection via INET command, I use Inet.UserName and Inet.PassWord property for generate an INET.url string like this:

http://username:[email protected]

but I don't know how to set domain string into INET command or INET.url string .
Can you help me?
Thanks in advance. Raoul