1. contact the user (User Interface).Because the OS was created with the main purpose is to facilitate the work to the user by the user does not need to know the hardware can run easily, so there must be a section that serves to connect with users in a manner that is easy to use.2. the operation of the computer.OS as an intermediary between the users connected to the hardware by the user do not need to understand the operation of the hardware, the OS must, therefore, have a duty to control the operation of the hardware, the user agent will have a routine, which will govern each type of device.3. the allocation of resources in the system.In the operation of the computer. It is necessary to use resources such as CPU, memory, helped etc, and these resources are limited and therefore need to be allocated, the maximum benefit and to make the process more efficient.
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