Monday, April 27, 2009


The Slideshow is a modern concatenation of "Slide Show". A slideshow is a display of a series of chosen images, which is done for artistic or instructional purposes. When Slideshows conducted by a presenter using an apparatus, such as a carousel slide projector, an overhead projector or in more recent years, a computer running presentation software. The term originates from the use of slides which have been around for many years. Slides originally were projected on movie theater screens by magic lanterns as part of the program of early moving picture shows.

A well organized slideshow allows a presenter to lend visual images to an oral presentation. The old adage "A picture is worth a thousand words" holds true, in that a single image can save a presenter from speaking a paragraph of descriptive details. As with any public speaking or lecturing, a certain amount of talent, experience, and rehearsal is required to make a successful slideshow presentation.

Wednesday, April 15, 2009

Web operating system

In metacomputing, WebOS and Web operating system are terms that describe network services for internet scale distributed computing, as in the WebOS Project at UC Berkeley, and the WOS Project. In both cases the scale of the web operating system extends across the internet, like the web.

However, the terms WebOS and Web operating system have been employed more broadly and with far greater popularity in the context of "the web as in HTTP", and for many meanings ranging from singular systems to collections of systems. In April 2002, Tim O'Reilly spoke of "the emergent Internet operating system" as an open collection of Web services.

Common to uses for collections of systems, a Web operating system is distinct from Internet operating systems in that it is independent of the traditional individual computer operating system. This conception of the system reflects an evolution of research in the field of operating systems into the increasingly minimized (for example, TinyOS and Exokernel) and distributed (for example, Inferno), and for distributed systems increasingly defined in terms of the specification of their network protocols more than their implementations (for example, Plan9's 9P).

Monday, April 6, 2009

HTTP cookies

HTTP cookies (also referred to as Web cookies, tracking cookies, or cookies) are small text files containing a user's settings and other data used by websites, and are stored on the user's computer. They are transmitted as parcels of text sent by a server to a Web client (usually a browser) and then sent back unchanged by client each time it accesses that server. HTTP cookies are used for authenticating, session tracking (state maintenance), and maintaining specific information about users, such as site preferences or the contents of their electronic shopping carts.

The term "cookie" is derived from "magic cookie," a well-known concept in UNIX computing which inspired both the idea and the name of HTTP cookies. Some alternatives to cookies exist, but each has its own uses, advantages, and drawbacks.