Yes and mostly NO.
Yes: You can set up a relationship that will be used when you open a query
to set default relationship.
No: HOWEVER, to have a relationship that controls the data - enforce
referential integrity, cascade delete, cascade update - the tables must be
in the same database AND the relationships must be set up in the database
containing the tables.
>I have to maintain an application that I did not write and is set up in a
> weird way.
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> and the 'one' side in the other database. Can relationships be defined in
> these circumstances?