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welcome to lesson one point three of the OCR entry-level certificate in computer science video tutorial course in this video we examine the concept of operating systems in this lesson you will learn to define the term system software proprietary software and open source software you will be able to identify a range of operating systems and categorize them as open source or proprietary software finally you will learn the basic functions of an operating system including memory management management of hardware and management of both the central processing units and memory before we begin lets recap two key terms in the previous video we looked at hardware which is the NIMH for the physical electronic components of a computer system in the following lessons for test one you will be looking at software which is the name given to the curda instructions that tell the hardware what to do and how to operate lets begin by defining the terms system software proprietary software and open sourc