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Client side is a relative term, and in order to be a client you do not necessarily have to be purchasing anything.
Web sites are hosted (located) on a server computer, and sent to client computers that request them via HTTP.
Display Stock Info Tutorial
A potential client came to me needing to know if they could display their current stock price on the company website. I knew it was possible. One of my first lessons was how to make a stock ticker in PHP, I just could not remember how I had done it. This tutorial seems to take care of the task with an elegant solution. Of course, it would look a lot nicer without the table in the markup- but you will get the idea.