Alex, since this is getting more into the table structure and relations, can you submit a case on this?
Perhaps once you construct your query to pull the info, you can post it back to this thread...
Note: DPA is NOT to be used for auditing purposes. Our polling occurs once per second, so there will certainly be logins and activity that is missed.
Thanks for the answer, it needn't to be 100% complete. Just to get an overview on Logins of particular Dates. Is there a description of DPA's base tables?
Clarification - were you looking for logins to DPA or logins to monitored instances?