Desktop systems continue to decrease in size and cost. They contain electronic and electromechanical components like motherboards, memories, input and output devices that allow them to run various operating systems. Clustering allows closely linked computer systems to share storage over a LAN, providing high-availability services. There are asymmetric and symmetric clustered systems that have features like node-to-node connectivity and support for LANs and WANs. Mobile computing devices like PDAs and smartphones can connect to networks and the internet but have limited size, memory and display compared to desktop systems.

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2.  The desktop system are again reduced by its sizes ,
as well as cost.
FEATURES :-
Size
Motherboard
Speed
Memories
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3.  Most of the component used in this computer are electronics or
electromechanical devices. They are as follows:
 INPUT DEVICES
 OUTPUT DEVICES
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4.  SECONDARY STORAGES:
 MAIN MEMORIES
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5.  May run several different types of operating systems
Mac OS
UNIX
windows vista
windows 2000
windows xp
Windows 2003
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7.  Clustering allows two or more systems to share storage.
 Clustered computers share storage and are closely linked via
LAN networking.
 Provides a high-availability service.
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8.  There are two types of clustered :
 Asymmetric clustering:
 Symmetric clustering:
 FEATURES of CLUSTERD SYSETEM:
 Node to node
 LAN & WAN
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9. ADVANTAGES:
 Through put of the operating system is increases.
 Also supports networking.
 It is used for communication purpose.
DISADVANTAGES:
 Only supports networking application.
 Its very costly.
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11.  It includes Personal Digital Assistance(PDA) such as
palm pilots or mobile phones with connectivity with
networks and internet.
FEATURES:
 Limited size
 Memory
 Display
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12. ADVANTAGES:
 It is used for mobile.
Disadvantages:
 Only supports for some special application.
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