Cross Forest Resource Security Cross-forest resource security     To grant access to resources from one forest to another:   Create/ensure they have a forest level transitive trust   Create a domain local security group   This group will be what is assigned to the resources.   File shares, delegated AD permissions, etc should point to the domain local group   Create a universal security group   This will be what the users are added to   Assign the universal groups as a member of the domain local groups