Mac OS X 10.0 (Cheetah) was released March 24, 2001. Mac OS X 10.1 (Puma) was released September 25, 2001. Mac OS X 10.2 (Jaguar) was released August 23, 2002. Mac OS X 10.3 (Panther) was released October 24, 2003. Mac OS X 10.4 (Tiger) was released April 29, 2005. Mac OS X 10.5 (Leopard) was released October 26, 2007
operating system is a control program as it allow multiple task to performed on same window.
What exactly do you mean by 'optimal operating system'? If you don't define the term there is no way to answer the question.
User Rights
DOS is short for disk operating system.
States define an exact operating condition of a system, where modes define the set of capabilities or functions which are valid for the current operating condition. (Source: http://themanagersguide.blogspot.com.au/2011/01/6322-define-life-cycle-system-modes.html)
Operating system software .....OPERATES !! and utility software....UTILIZES !! ..now go do your research .
"Portable Operating System Inferance (for Unix)
NFS is the Network File System, and allows directories from systems to be used in other systems in a sharing arrangement.
An operating system typically provides user interface tools, such as menus and toolbar buttons that define the "LOOK AND FEEL" for all of its compatible software.
All operating system are made using c-based language.
Raw file system is a situation where the extension of your file system files has been deleted and the operating system can't recognize the particular volume and access the data from it.
Jobs with similar needs are batched together and run through the computer as a group.