Tuesday, December 16, 2008


The Internet is a worldwide system of interconnected computer networks that interchange data by small package switching using the standardized Internet Protocol Suite (TCP/IP). It is a "network of networks" that consists of millions of private and public, academic, business, and government networks of restricted to global scope that are linked by copper wires, fiber-optic cables, wireless connections, and additional technologies.

The Internet carries a variety of information resources and services, such as electronic mail, online chat, file transfer and file sharing, online gaming, and the inter-linked hypertext documents and other resources of the World Wide Web (WWW).

Wednesday, December 03, 2008

What is pointing device?

A pointing device is an input interface (particularly a human interface device) that allows a user to input spatial (i.e., continuous and multi-dimensional) data to a computer. CAD systems and graphical user interfaces (GUI) let the user to control and give data to the computer using physical gestures — point, click, and drag — for instance by moving a hand-held mouse across the surface of the physical desktop and activating switches on the mouse. Movements of the pointing device are echoed on the screen by movements of the pointer (or cursor) and added visual changes.

While the nearly all common pointing device by far is the mouse, a lot of more devices have been developed. But, mouse is normally used as a metaphor for devices that move the cursor.