Open Virtual Memory System (OpenVMS), initially known just as Virtual Memory System (VMS), is the name of a high-en computer server operating system that runs on the VAX and Alpha families of computers, developed by Digital Equipment Corporation of Maynard, Massachusetts (DEC was later purchased by Compaq, and is now owned by Hewlett-Packard), and most recently on Hewlett-Packard systems built around the Intel Itanium CPU.