To connect to a remote network
If Logon domain does not appear in this dialog box, and you want to log on to a domain, type your user name and the domain name in one of two ways:
Note that the suffix in the first example is a fully-qualified DNS domain name. Your administrator might have created an alternative suffix to simplify the logon process. For example, creating a user principal name suffix of "microsoft" allows the same user to log on by using the much simpler user@microsoft.com. For more information, see your system administrator.
Instead of having to type your domain name, you can also enable Windows to include your logon domain to the Connect connection type dialog box.
Once you are connected to the network, you can minimize your connection window and use e-mail, Windows Explorer, and so on.
Notes