DNS and user account settings for 2 way trust

Ok here we go, I want to setup a 2 way trust between two independent forests, we'll call them Chicago.local and LA.local.  

I host an exchange 2003 server out of my chicago.local domain and my users in my la.local domain get their e-mail from my exchange server via http.  So I have a few questions:

-Will the trust between the domains have any effect on the http mail download?  Users in la.local have an account for their local logon, and an account in chicago.local for their e-mail.

-My second question is regarding dns, If I setup forwarders on my DNS servers will it only forward requests for authentication on the opposing domain or will it forward internet requests to a dns server in the other forest?

thanks
jmtomanAsked:
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AkhaterCommented:
1) No affect at all

2) if you setup forwarding your dns server will forward ALL requests he is unable to answer (i.e. also internet requests) if you want you can setup conditional forwarding instead that would solve that part
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jmtomanAuthor Commented:
ok, one more question, is there a simple way to setup WINS resolution between the two?  I'm assuming i'll also want to set that up so users aren't using fqdn all the time.
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AkhaterCommented:
if all your clients are windows xp and above there is no need for wins just add domaina.com and domainb.com in the dns suffix
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