HP OpenVMS System Services Reference Manual 2

This document is the HP OpenVMS System Services Reference Manual (GETUTC–Z, June 2010), intended for system and application programmers.

It details a set of routines/system services used by the HP OpenVMS operating system for controlling resources, process communication, I/O, and other core functions. The manual highlights support for 64-bit virtual memory addressing on OpenVMS Alpha and Integrity server systems (Version 8.4), explaining how services manage this address space and the "_64" suffix used for 64-bit compatible services. This edition supersedes previous versions of the manual (e.g., Version 8.3).