O/S Authentication on WindowsNT

I've a Problem with authentification in a Oracle DB over a windows NT Domain User.

I tried it with user identified EXERNALLY option, but when I use this, i must be loged on at the NT Client and have to be a local USER on this NT Client.
Must The Oracle Server be in the same Domain Like the Users are, or can it be in a different one ?

Is There an other way to Authenticate in Oracle with the NT Domain Users as with the
EXERNALLY option ?

Greets Felix

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