I "revived" this article of mine wrote a bit 'of years ago. I slightly revised, updating a little bit here and there, but I think it is still relevant and interesting.
INTRODUCTION
What is a development language? A computer, aka PC (Personal Computer), has a personal language. This language is called machine code, to mean that every machine, so any computer (PC compatible, Apple, Unix, etc ...), it has a unique and proprietary. The programs that we see "run" on our PCs are mainly carried out by the mysterious object called a microprocessor. This represents the heart, the intelligent unit, of each electronic processor. In reality, an application is not executed by the microprocessor, but relies only, so to speak, in what is called operating system: a layer software from the manufacturer of the machine (see, for example, the Apple Macintosh).
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vik : Users custom fields seems interesting, should be added the ability to validate the field based on ...
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and a 
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