ABSTRACT
Virtualization is the logical division of a physical machine into multiple virtual machines (VMs), sometimes called guests. The concept of virtual systems came mainly from ideas developed in the 1960s and made into a time-sharing software product called Control/Program Cambridge Monitor System (CP/CMS). CP/CMS became CP-40 and evolved into CP-67, which appeared in 1967. (It also owes something to MIT's Multics * [1969].)
