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And how exactly does apache read a file into it's ram? how does it request that ram be allocated by the system? how does it establish a socket, how does it pass data to the ip stack and ultimately to the network interface? The answer to ALL of these questions is calls to the OS. To say Apache "pushes it through the network interface without involving the system at all." really shows a lack of understanding, I mean do you think apache ships with an IP stack or NIC drivers??? Of course it does not. I think that upon closer inspection (or more careful thought), you might want to rethink your evaluation of my example.