It has toolbars which can be customized. It has user definable 3-D coordinate systems. The alias commands can also be defined. The objects can be grouped and external drawings can also be refrenced. It has programmality options that allows use of custom built add-ins and third party applications.
Original files are never converted-they are simply updated.
It has Support for Architectural, Survey, Engineering, Decimal and Fractional Units. An optional printer driver is available.