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Operating systems     Operating system is a program that act as an intermediary between a user of a computer and the computer hardware and it provides a environment for execution of programs another set of OS functions exist for ensuring efficient operation of the system. They are,     - Resource allocation     - Accounting     - Protection and security     - User interface     - Program execution     - I/O operations     - File system manipulations     - Communication     - Error detection Distributed systems     Distributed system is a collection of physically separate, possibly heterogenous computer systems  that are networked to provide the users with the access to the various resource that the system maintain. The characteristics of a distributed system     - Fault tolerance     - High...

Extensible Business Reporting Language(XBRL)   is used by public and private enterprises to publish and share financial information with each other and industry analysts across all computer platforms and the internet. Book 1 is an example of how Name Box are numbered and named during each work session. Back up is Using earlier data Voice mail is functions much like an answering machine, allowing callers to leave a voice message for the called party. When data changes in multiple list and all lists are not updated, this causes data inconsistency. Control structures are words that a programming language has set aside for its own use.   Memory contents are lost when the computer turns off. Scanner can input graphical images and pictures for a computer. Windows are not common feature of software applications Linux is Shareware and Open source software. Expansion cards are inserted into Slots. Digital camera is an  input type device. Web-hosted technol...

In a  computer ,physically connected to the computer , something tangible. full list of component of a computer chassis Disc drive : CD ROM,CD-RW,DVD,Blu-Ray Expansion card Fan Floppy Drive Hard Drive Mother Board Power Cable Power Supply Processor Includes or can install these components Flat Panel Display Monitor  Keyboard Mouse(coodless,foot mouse,intellimouse,j mouse,joystick,mechanical,optical,touch pad, touchball, touchpoint) printers scanner CD -ROM DVD CPU - brain of a computer HardDrive - storage of a computer Mother Board RAM - main memory ,primary memory, random access memory, system memory Sound card Video card modem(Internal,external,removable) NIC-network interface card (content was taken from "Learn computer in 30 days" in appstore)