OpenVMS I/O User’s Reference Manual

This manual provides detailed information for system programmers who need to perform input/output operations by interfacing directly with device drivers in the OpenVMS operating system. It covers the Queue I/O (QIO) interface, including ancillary control processes (ACPs), disk drivers, magnetic tape drivers, the mailbox driver, the terminal driver, the pseudoterminal driver, the shadow-set virtual unit driver, and local area network (LAN) device drivers. The manual is intended for use with OpenVMS Alpha Version 7.0 and OpenVMS VAX Version 7.0.