## Presentation Device Driver Reference for OS/2

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### Extended Attributes

Extended attributes (EA) are used for correct installation and operation of multifile drivers. They are also used for improved performance during installation.

Extended attributes serve three purposes:

Installation of multifile drivers
Version numbering
Improved performance of drivers in the Workplace Shell*

Performance is improved because the Workplace Shell no longer needs to open a Device Context to the driver, which causes the driver to be loaded each time it needs Icon and Device Name information.

Names are separated by commas when more than one name is defined in an extended attribute. The following examples of extended attributes are for the HP LaserJet** hardcopy driver.