cgi?

is cgi a rather simple language to learn?  Is it even a language?  I've heard all kinds of things about cgi and I want to know how to write it, what it can do, and what you need to write it.  Is their something that cgi is comparable too?  
cfrericksAsked:
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julio011597Commented:
CGI is but a _protocol_ stating what kind of communication can happen between a web server and an external program (the so called "CGI" program).

The CGI protocol basically states that the web server writes to the standard input stream of the program, and reads answers back from the standard output stream of program.
It also contains rules on what kind of environment variables (not to be confused with _system_ environment variables) the web server gives to the program, and what kind of status messages and mime type indications the program has to give back together with the document it generates on the fly.

Ok, maybe a bit confusing, but there are books full of this stuff.

And, as you can see, it is NOT a language; instead, you can write the external program in _any_ language you like, provided that the resulting program behaves following the CGI protocol rules.

Hope this makes things a bit clearer,

julio
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