The tag properties database stores the working copy of all tag properties for an application. Each time a new application is created, a blank tag properties database is added to the new application's directory.
The tag properties database is a Microsoft Access Database file (.mdb file). Applications can use databases that are stored in any format supported by the ODBC drivers that are installed on your machine. By default, the tag properties database for each application you create is named "Points.mdb"; however, this name can be customized according to your needs or you can change the database to which your application connects (see Change the Name of the Tag Properties Database (Points.mdb) for instructions).
It is important to here that the tag properties database does not store drawing characteristics for each tag. It only stores the properties or characteristics for the tags themselves, such as their I/O address and scaling data.