Points.mdb is the tag properties database that is created within your application directory each time you begin a new application. Points.mdb contains the properties for each new tag you create.
Points.mdb consists of a series of pre-defined tables, each of which represents a specific tag type (i.e. "AnalogInput", or "DigitalOutput"). Each record within a table represents an instance of that tag type (i.e. a tag). Each field within a record represents a specific property of that tag (i.e. "Name", or "Description").
Detailed information on Points.mdb can be found in "VTS Developer's Guide: Tag Properties Database (Points.mdb)".