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Software (Operating system functions (modes of operation (real-time…

- - - - when the computer has to react within a guaranteed time to an input
    - - method of operating several programs appear to be running at once
    - - where programs or data are collected in a batch and processed in one go
    - - where the tasks of the cumpter system require a continual exchange of information between the user and the computer system.
    - - it allows multiple tasks to run concurrently
    - - its where serveral users can use the same system via a LAN
  - - - The instructions that tell a computer what to do are written in machine code. Machine code is a series of numbers written in binary.
    - - languages that sit close to the computer's instruction set
        
        An instruction set is the set of instructions that the processor understands.
  - - - comand-line interfaces
        
        allows the user to intereact with the computer by using comands
        
        don´t need memory of the latest computer
        
        don´t need to run in Windows
        
        can run many programs
      - menu driven interfaces
        
        simple menu; simple menu to choose an option
        
        full screen menu; the manu takes up the entire screen
        
        menu bar: options at the top of the screen
      - graphical user interfaces
        
        the user choose an option by pointing with the mouse an option
        
        easier for beginners
        
        use a lot of memory and processing power
- - - - general purpose software taht is not written for any particular type of business
    - - a collection of software that has a common set of commands/icons
    - - software written for a defined purpose
    - - written when a company requires a piece of software to perform a specific task or function
    - - virus scanners, disk defragmenters and backup utilities