Legal drinking age. The legal drinking age is the age at which a person can legally consume or purchase alcoholic beverages. These laws cover a wide range of issues and behaviors, addressing when and where alcohol can be consumed.
An open system is a system that has external interactions. Such interactions can take the form of information, energy, or material transfers into or out of the system boundary, depending on the discipline which defines the concept.
OpenVMS is an operating system from the Digital Equipment Corporation (DEC) that runs in both its VAX and Alpha computers. OpenVMS evolved from VMS, which originated as the operating system for the VAX in 1979. VMS exploited the concept of virtual memory. DEC is now part of Compaq. OpenVMS is a multitasking and multiprocessing operating system based on VMS; it was renamed OpenVMS when it was redeveloped for the Alpha processor. (OpenVMS is also the name now used on the VAX computer.) The Open suggests the added support for the UNIX-like interfaces of the POSIX standard.