Terminology

Operating system:

VMS = Virtual Memory System

32 and 64 bit operating system developed by DEC/Digital/Compaq/HP/HPE/VSI.

Also known as VAX/VMS and OpenVMS.

Hardware:

VAX

The 32 bit processors made by DEC that VMS was originally developed for

Alpha alias AXP

The 64 bit processors made by DEC capable of running VMS

Itanium alias IA-64

The 64 bit processors made by Intel capable of running VMS

Command shell:

DCL = Digital Command Language