WiFi

                  WiFi, wireless fidelity is the way to connect devices together without wires.  It can be done in homes, businesses, between businesses etc.  WiFi offers a lot of advantages over LANS, but it does include disadvantages. 

HOW DOES IT WORK

                  Wireless Internet Access has four components that form its structure: high-speed access, a networking gateway, a wireless network and a wireless customer.  The customer connects wirelessly through the wireless network to the gateway, it then launches their internet browser, authenticates through the gateway by entering a coupon code or purchasing time and the user has high-speed internet.

The four components are:

1)High-speed access which is also known as broadband is an internet connection which is generally faster than dial up service.  Examples of high-speed internet access are ISDN, cable modem, DSL, and also  satellite services.

2) Network Gateway is between your high-speed access connection and the wireless network, it acts like a gate.  This gate will prevent people from accessing your wireless network unless you know about it, the gateway also allows managing tools as well.  These can include authentication, network monitoring, and other services such as printing and voice over IP. 

3) Wireless local area network is a system of connecting PC's and other devices within the same physical proximity using high-frequency radio waves instead of wires.  Wireless networks work as long as your wireless ready device is within range.

4) Wireless customers are people who have a PC and a wireless adapter which means they can access the internet wirelessly.  The wireless adapter can be built in or it can be an external device plugged into your computer. 

WiFi, allows a universal internet connection to be bordercast through radio waves.

                    Radio waves are what make WiFi exist and run.  They allow WiFi networking to occur between numerous people.  The radio waves are transmitted from antennas and routers and are picked up by WiFi receivers such as computers and cell phones equipped with WiFi cards.  When these devices receive a signal within the range of a WiFi network, the WiFi card then reads the signals and produces an internet connection without a cord.   Once a connection is established between user and the network , the user will be prompted with a login screen and password if it is fee based.

                  WiFi networking around the world is creating not spots in the cities where anyone with a laptop can wirelessly plug into the internet.  Hot spots are connection points for WiFi networks; areas where wireless internet is available for those who have internet ready devices.  Hot spots are becoming available everywhere, in restaurants, hotels, airports, schools, etc.

               The following is a simple and understandable way to picture the way WiFi works.  The main source is the antenna; the antenna sends radio signals to the people who want to access the internet.  The people wanting access must have a Wife card; the Wife cards receives the radio signals through its' Wife receivers and creates a wireless connection.

Web Servers
                     Web servers are computers that deliver (servers up) Web pages.Every web servers has an IP address and possibly a domain name. For example, if you enter the URL http://www.news.lk/index.html in your browser, this sends a request to the web server whose domain name is news.lk. The server then fetches the page named index.html and sends it to your browser.
                      Any computer can be turned into a web server by installing server software and connecting the machine to the Internet. There are many web server software applications, including public domain software from NCSA and Apache, and commercial packages from Microsoft, Netscape and others.

Tsunami Alarm System 

              The hazards that originate from tsunamis have been recognized for some time. Newspaper reports about undersea earthquakes and movies about meteor-inflicted tsunamis have contributed to public awareness of the threat. Early warning systems were constructed and deployed for instance in the Pacific Rim. Many areas in the world, however, are not covered by traditional warning systems.At the latest in December 2004, when a tsunami has devastated wide areas bordering to the Indian Ocean, the extensive media coverage has elevated the sheer possibility, the effects and the dangers of a tsunami into global public consciousness.In the memory and perception of tourists and holidaymakers seashore sites may forever bear tsunami-related dangers, resulting   in the desire for effective,reliable and easy-to -use tsunami alarm systems.

                     Our Tsunami alarm system contributes to alleviate this problem and has been filed for patent protection. The Tsunami Alarm System has recently been introduced into the market and users can now subscribe. Subscribers to this alarm system will reliably receive an alarm to their mobile telephones, as and when a dangerous tsunami is evoked. In this way the invention enables people to take preventive action many minutes before the devastating tsunami arrives.

ISP

ISP stands for Internet Service Provider, a company that provides access to the Internet. For a monthly fee, the service provider gives you a software package, username, password and access phone number. Equipped with a modem, you can then log on to the Internet and browse the World Wide Web and USENET, and send and receive e-mails. In addition to serving individuals, ISPs also serve large companies, providing a direct connection from the company's networks to the Internet. ISPs themselves are connected to one another through Network Access Points (NAPs). ISPs are also called IAPs (Internet Access Providers).