Why are process and thread IDs multiples of four?

On Windows NT-based operating systems, process and thread IDs happen always to be a multiple of four. Is this just a coincidence? Yes, it's just a coincidence, and you shouldn't rely on it since it is not part of the programming contract. For example, Read More......(read more)

Written by The Old New Thing : History on February 28th, 2008 with comments disabled.
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