So create a site such as adding text, graphics, scripts a little and not so free And then confronted with the concept of asynchronous programming Why do we? Why not just make a normal page with the price list and such as telephone and icq? Many people do so but not you. The essence of asynchronous programming is that the browser client does not wait until the server processes the request. That is, you press the button clicks on the link and all is well with both conventional computer programs. There are of course various server technologies and they have evolved considerably in recent years. But they face the challenge of simultaneously servicing multiple clients. Imagine a website that 'cooks' coffee for the campaign. There is a Web interface connected to it coffeemakers. One coffee maker, and her office staff queue.

And if the coffee machine two. While the server maintains coffee maker for one client, the client browser is busy – he waits for a response to a request to the first coffee machine, blocked access to the other, you must wait until released first and then get a request to the second-and result you are left without coffee. How asynchronous programming is more complicated: For your user does he rejoice even as fast and cool your site is working for you, this greatly complicates the task of creating site. How much depends on the specific implementation. When you combine asynchronous javascript with PHP you get you get access to 'open' open source community is also at the moment there are available packages adobe spry, jquery and others that are much facilitate the process. Do have with an eye to the future. Coming era WEB 2 0 social networking and your beautiful site but lost among the standard more modern.