removing a windows domain trust, how can i audit systems/services and tell what users are going to get affected?

hello! my company is going to be deleting a domain trust (2 way) for licensing reasons, and we need to find out what users/services are going to get affected. is there any programs to audit what is being accessed between 2 domains, or any other way i would be able to find out what users are accessing what services on the adjacent domain before we delete the trust, so we can setup the appropriate permissions on the other domain for certain users?
thanks in advance!!

jsctechyInfrastructure Team LeadAsked:
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