Computing revision

Computing revision

1. Software procurement

   • off the shelf
     • can be purchased from a high street or online store. Boxed up and ready to install. May come with un-needed accessories
   • custom written
     • Sometimes know as Bespoke software. Software that is written for on customers requirements
   • Propietary
     • Copyrighted. Has been developed for profit and the source code has been retained as a trade secret
   • Open source
     • Source code has been modified and the software is redistributed. placed in public domain

2. Utility Software

   • Utility software is system software designed to help analyze, configure, optimize or maintain a computer.
   • Examples of utility programs are antivirus software, backup software and disk tools.

3. Operating system

   • What is it?
     • the low-level software that supports a computer's basic functions, such as scheduling tasks and controlling peripherals.
   • Features
     • scheduling - The task of handling how active processes are making efficient use of the CPU processing cycles is called scheduling
     • Memory management - The operating system has to make sure that applications are able to run in the amount of memory available and that they do not interfere with one another
     • Allocation of resources - The operating system will provide a working area for each user

4. what is software

   • the programs and other operating information used by a computer.