1462	 Multilevel Operating Systems	 The Basic software for all newer computers is built on the well-established need for standard operating systems. This implies that all applications-no matter how large complex or time consuming-must operate under or more precisely on top of the standard system. Large applications require supervisory monitors which handle problems similar to those of the operating systems but at a different level. Sometimes still a third or even a fourth such level is required or desirable. This leads naturally to the concept of multilevel systems-similar vertically but different horizontally. Proper division of responsibility between levels leads to greater efficiency and less logical complexity while actually enhancing capability.
