Hide Domainname while login / use alias domainname

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Hello,

usually when a user logs in a domain he can see the domain name in the
windows login-screen (and can select from there if he wants local login or a
domain login)

Is there a way that I can "rename" the domain name that the users see in the
login-screen?

So for example my domain name is "myDomain.com" but I want the users to
see "ComanyA.com" during the Login-process
(of course authentication is against "myDomain.com" - but the user should
see "CompanyA.com")

We use XP clients with a 2003 Domain

thank you





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