every computer has a central processing unit or CPU in it to perform a specific task.
a CPU contains: datat processing unit and control unit.
the Data Processing Unit consists of Airthmatic logical unit and some registers and the control unit consist of some hardware and software to generate a control signal .
whenever we want to perform some specific task we give computer an instruction or set of instructions called program. the definition of these instructions is stored in the memory of computer. these instruction are processed in a cyecel containing mainly three steps:
1.instruction fetch(taking instruction from memory)
2.instruction decode(understanding the meaning of an instruction)
3.instruction execution(performing the task0
each of above given step contains one or more steps further and these steps are called "microoperationS".
on execution of instruction the specified task is done..
The operating system.
system
The software that helps a computer perform essential operating tasks and enables other software to run is the operating system.
operating system
User RightsUser rights are specific operating system tasks, such as Shut Down the System or Allow Log On Through Terminal Services, which are performed only by certain users designated by a system administrator. User rights are managed from the local security policies or group policies.Reference Lesson 9 of the Windows 7 configuration Manual
The operating system allows you to use the computer, but you need specific programs to perform specific tasks. There is no single piece of software that allows you to perform every specific task.
Operating system CD
Windows Vista
An operating system enables you to view files saved onto your storage devices and arrange them into a folder/directory/file structure.
It is a set of commands or actions that an operating system can perform and a way for a program or person to activate them.
A multitasking operating system.
system restore