Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.
If you wish to develop Internet applications but don’t have your own development server, you will have to upload every modification you make to a server somewhere else on the Web before you can test it.
Even on a fast broadband connection, this can still represent a significant slowdown in development time. On a local computer, however, testing can be as easy as saving an update (usually just a matter of clicking once on an icon) and then hitting the Refresh button in your browser.