Data Entry In MS Access - No Duplicate Records?

Is there an easy way to prevent the entry of duplicate records when entering data from a form in MS Access?
I think this is a pretty clear explanation but feel free to ask questions if my question is not understandable.

As always - thanks in advance, I know the dopers won’t let me down (even if the answer is that it can’t be done)! :smiley:

If you edit the design of the underlying table, you can set one or more fields to be indexed with no duplicates…

Or set one or more fields to be the primary key.