Windows NT 2000 Trust Relation Ship

Dear Sir,

I have two different DNS with separate Active Directory Services that one of them is production and another is Test, now they are working separately and haven’t Trust.

I have emphasize that in my test System installed Exchange 2000 also and as you know Exchange 2000 is very senceitive to DNS when I have to connect it remotely, by Exchange 2000 System Manager.

I have to know exactly Step By Step how can I make Trust between to DOMAINS with different DNS. Navon