windows authentication - search multiple domains

I am wondering if it is possible to have windows search multiple domains or a trusted domain for a particular username.  

We have a trust setup between domain-a and domain-b.   I have radius server on domain-b for vpn authentication.   Users in domain-a have to use  "@domain-a.com" on their username for it to work.  Users in domain-b don't need to add the domain.   Is there a way to setup Windows so that it will search a trusted domains directory for a username if it is not found in its own directory?

Thanks.
tiptechsAsked:
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David Johnson, CD, MVPConnect With a Mentor OwnerCommented:
It doesn't do a search it tries to logon to a specified domain using a specified username and password. Anything else would raise considerable security concerns.

the domain\username is always passed to the authenticator. Even on a local machine without a domain.

administrator@domaina.com, administrator@domainb.com, and localpc\administrator are 3 different accounts.
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David Johnson, CD, MVPOwnerCommented:
Simple answer AFAIK is no..

If you look on your logon screen you will see the default domain already populated.
logon screen
Short Video http://screencast.com/t/AJJePYecUW5U
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tiptechsAuthor Commented:
I understand with regards to a PC and the domain.  Just wasn't sure if there is an option within AD to check a secondary domain or something like that when you have a trust setup.

Thanks.
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