VMS is any operating system of the VMS family: OpenVMS, VAX/VMS, and VAX-11/VMS which run on the VAX, Alpha, and Itanium-based families of computers. Note: This tag should not, as a rule, be used for Virtual Machines (VMs).
openvms (Open Virtual Memory System), previously known as VAX-11/VMS (1975-1980), VAX/VMS (1980s), and OpenVMS (since 1992) is a computer operating system that runs on VAX, Alpha and Itanium-based families of computers.
VMS was developed specifically for 32-bit processing in 1974, based on RSX-11 for PDP-11 computers. VMS simultaneously supports realtime, interactive, and batch operations. Its API is uniquely distinct from other operating systems, though a high degree of posix compatibility is available when development targets the C language runtime libraries.
Since the 1990s, an x-window-based GUI is available on workstations.
dcl is the command shell and batch language of VMS.
Note: This tag should not, as a rule, be used for Virtual Machines (VMs).
Reference:
