These 'local' scripts are more limited in what they can do, but usually the response is instantaneous - much more desirable for the user. These products usually require extra plugin software to be installed on the users computer, to run in conjunction with the Web browser. For more detailed information, see Interactive Web pages. Keeping track of useful resources With millions of resources available, identifying and finding useful material can be a problem. Bookmarks are a way of saving and organising URLs, thus enabling users to keep track of Web resources which they find useful.
Most browsers provide a facility for hierarchical organisation of annotated bookmarks.
The WWW is now a densely populated place and new sites proliferate at a dramatic rate. The Web has a presence in most corners of human activity, ranging from recreation to education, from scientific research to commercial transactions, and most areas in between. On the Web you can buy a house, find a job, book a cruise, check out weather maps, browse a local newspaper, look at a medieval manuscript or take a tour of the solar system. The most interesting sites are of course the ones which contain information which is pertinent to the user's interests or concerns - sites which offer solutions to problems, commercial advantage, information which is otherwise unavailable, or just plain convenience. For instance, the Web might be used to look up a list of local medical practitioners, which movies are showing in town this evening, the price of company X's shares, whether the parcel you sent today has reached its destination.