SAS/ACCESS 9.1 Interface to SYSTEM 2000: Reference
Learn how to create descriptor files that allow you direct access to SYSTEM 2000 databases from within SAS using the ACCESS procedure. You can extract data into a SAS data file for processing and you can update the data in SYSTEM 2000 databases using SAS procedures such as SQL, APPEND, and more.

http://support.sas.com/documentation/onlinedoc/91pdf/sasdoc_91/access_2k_7010.pdf