The same rules are utilized to the only user atmosphere; on account that users intend to run multi programmes at an identical time. McNamara 2009 defined that digital memory on any other hand; is a methodology that makes it possible for the partial of the execution of tactics to come about outside of the physical reminiscence. The following are the merits of digital reminiscence:However, virtual reminiscence can considerably shrink efficiency if the implementation of such technique were done carelessly Silberschatz and Galvin, 2009. Multi User and Single User Systems – RAM represents inside of any computing equipment the amount of actual memory installed on personal computer and servers. It acts like brief term memory, allowing courses to load and function quicker. When user begins a software or an application, it uses a component of that reminiscence.