Greg,

>I know MM uses a number of system tables, and I don't want to close anything that I shouldn't.>

It depends on what you're doing after you close the tables...For example, if you try to call the Abstract Factory after closing all the tables, you'll get an error since the Abstract Factory needs its "Classes" table to function properly. In addition, you'll obviously want to reopen the tables when you're done!

Regards,