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I use Apache on Windows. I always see at least 2 http.exe entries in process list on Windows Task Manager. Most of the time it is in the range of 3 -5.

What is the number of http.exe instances correlated to?

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By default, Apache uses the mpm_winnt multiprocess module (MPM) to manage processes. You'll notice in the documentation that it will launch a "single control process which launches a single child process which in turn creates threads to handle requests." The additional processes you're seeing are most likely the additional threads that are being created.

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