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What is Operating System?

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Hardware is nothing but finely  designed machinery. A machine is ultimately a machine only,which is always made to work. In case of computers, it is either us if we do that or some other which does it for us. This some other is nothing  but our very  own operating system.    Operating system is just like our secretary. As the boss gives orders to his secretary and the secretary does all work for his boss. The secretary himself decides: How to do? what to do ?;etc Same way we pass our orders/requests to operating system and operating system does it for us. Operating system itself decides: How to do?; What to do?;  When  to do ? The primary goal of an operating system is thus to make the computer system convenient to use and secondary goal is to use computer hardware in an efficient manner.      An operating system is an important component of a system which controls all other components  of  a computer of a computer sys...

How to use text attributes?

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  USE OF TEXT ALIGN AND TEXT INDENT <html>  <head>  <title>Text Attributes</title>  <style text="text/css">   h1{     font-family:arial;     font-size:26pt;     text-decoration:blink;     color:red;   }  p{    font-size:12pt;    font-style:normal;    font-weight:bold;    color:#23238e;    text-align:justify;    text-indent:.5in;  }  </style>  </head>  <body>  <h1>Web Designer And Devlopment</h1><b><u>without text align,first line indent</u></b>  <p>    Most communication satellite have multiple, independent reception and transmission devices known as transponder. In a commercial communication satellite, a single transponder is usually capable of handling a full -color, commercial television transmissi...

Satellite Communication (Satellite Microwave)

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Radio wave can be classified by Frequency and wavelength. When the frequency  is higher than 3Ghz, it is named microwave . Satellite communication is special case of microwave relay system. Satellite communication use the synchronous satellite to relay the radio signal transmitted from ground station . In recently , the use of wireless communication has gained more popularity. Compare to the traditional fixed wire terrestrial networks, satellite and microwave communication network features the time saving, fast implementation   and abroad coverage characteristic. It provides voice,fax,data and video service as well as email,file transfer ,WWW internet application. When fixed wire terrestrial communication networks are crushed by a disaster, the satellite and microwave  system as a emergency backup  facility will be started.      In satellite communication the earth station consists of a satellite dish that functions as an antenna and communi...

What is VoIP?

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VoIP(Voice over IP) refers to a way to carry telephone calls over an IP data network. It offers a set of facilities  to manage  the delivery of voice information over Internet in digital form.

What are cookies ?

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Cookies are message that a web server Transmits to a web browser so that the web server can keep track of users activity on a specific website.

What is WWW?

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Full form of WWW is World Wide Web. The world wide web (WWW) is set of protocols that allows to you access any document on the NET through a naming system based on URLS(URL MEAN UNIFORM RESOURCE LOCATOR , Which is pointer to information on the WWW. It can include pointers to other types of resources such as FTP servers and gophers server in addition to WWW  servers) WWW also specific a way the Hyper Text Transfer Protocol(HTTP) to request and send a document over the internet. With these  standard protocols of WWW is place, one can set up  a server and construct hypertext document with links  in them that point to the document on the server.  

What is MAC Address?

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The Address for a devices as it is identified at the Media Access Control(MAC) layer in the network architecture. MAC address is usually stored in  ROM(READ ONLY MEMORY) on the network adapter card and is unique.
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How to use fieldset and legend in html

Booleans

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Booleans Derive their name from George Boole, the 19th century logician who developed the true/false system of logic upon which digital circuits would later be based. With this in mind, it should come as no surprise that Booleans take on one of two values. true or false .      Comparison expressions such as a<y evaluate to a Boolean value depending  upon whether the comparison is true or false . so the condition of a control structure such as if/else is evaluated to a Boolean to determine  what code to execute.  For example:  if(a==y) {   a=a+1; }     increments a by 1 if the comparison a equal to y is  true. you can use booleans explicitly to the same effect, as in var doIncrement = true; if(doIncrement)  { a=a+1; }   or  if(true) { a=a+1; }  Booleans are commonly included as object properties indicating an  on/off state. For example, the cookieEnabled properties o...

What is function in javascript

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f unction are used to encapsulate code that performs a specific task. Sometimes functions are defined for commonly required tasks to avoid the repetition entailed in typing the same statements over and over . More generally, they are used to keep code that performs a particular job in one place  in one order to enhance reusability and program clarity.           JavaScript function are declared with the function keywords, and the statements that carry out their operations are listed in curly braces. Function  arguments are listed in parentheses following the function name and are separated  by commas.   For example: function add (a, b) { var sum =  a+b; return sum; } This code declares a function named  add  that adds its argument  together and  "returns"    the resulting value. The return statement tells the interpreter what value the function evaluates to. For example, you can set th...