I ment the whole stack...not just a single fizzbuzz snippet. As I see it this is what is going on when your users use a webapp. The user runs some client code

I ment the whole stack...not just a single fizzbuzz snippet. As I see it this is what is going on when your users use a webapp. The user runs some client code which you wrote. In a browser which other guys wrote. Running on an OS made by some one. Sending data back and forth via protocols and network equipment with software that other people wrote. You server OS receives the request and passes it to your load balancer which distributes to Apache which forwards to PHP which routes to SQL...and all the way back. With the millions and billions of lines of code involved in these steps it could likely be a number of this magnitude. Actually it's a wonder that it works...