Oracle Database Discussions

Ok,
I am reaching here, because I have inherited an oracle database and I have a few tables that I am not sure if they are just orphaned tables or if they are built in oracle tables that are created when you start up a database instance. And from my perspective, I say orphaned tables because I can;t see anywhere in any of the logic that uses the database where these tables are used or referenced.

I have a table called MICROSOFTDTPROPERTIES. Does that sound like anything that is an automatic table. Just based on the fact that it is called Microsoft....something, pretty much tells me that it is not a built in Oracle table?

I am unable to contact the original person who created this database to get an explanation of all of the tables in the database.