Link or Button that executes command on server (where page is hosted)

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Is it possible to have a link or button on a website that when clicked
would run a command on the server where the page is hosted?  Not "from"
the server, but actually "on" the server, so the command does something
on the server and is executed by the server, not executed by the client
machine ... just to clarify :).

If so, could someone show me the html code for this?  I'm quite new to
html so if you can show all the code that would really help out.


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