(VM/CMS) An IBMtime-sharing and personal computing environmeNT executing under {Virtual Machine} (VM) in a virtual machine environmeNT. VM/CMS is designed to support large numbers of iNTeractive users. It relies on numerous APIs iNTo the CoNTrol Program (CP) to provide very efficieNT single-user processing VM/CMS was only adopted some time after the original design of Virtual Machine as a more efficieNT personal computing environmeNT than MVS/TSO. (1999-01-19)