ANSWERS: 3
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On the server, rather than the client system.
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I think you need to learn English before you tackle anything else.
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There are various languages used server side on a web server. Many years ago I did CGI scripts which could be any scripting language on the operating system. I used perl, but python is popular now. CGI can also be compiled binary programs (C, C++, etc.). Many people now use PHP or on Windows web servers ASP (or ASPX).
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