This manual is intended for system programmers who want to take advantage of the time and space savings that result from direct use of I/O drivers. OpenVMS users who do not require such detailed knowledge of I/O drivers can use the device-independent services described in the OpenVMS Record Management Services Reference Manual.

This manual is applicable for OpenVMS Version 8.4 for Integrity servers and OpenVMS Alpha Version 8.4.

This manual supersedes the HP OpenVMS I/O User's Reference Manual Version 8.2. Users of VAX systems running OpenVMS should see that manual, available at:

http://h71000.www7.hp.com/doc/os82_index.html.