In an operating system, from the boot-up to shutdown processes are created, killed or stopped continuously. It is a very dynamic environment but unfortunately we can not see the process hierarchy easily.
Well if you are curious about Windows NT here is a tool that you can use to learn more about it.This tool lets you see the process tree hierarchy on Windows NT 4.0 . I did not test it on Win 2K.
Please send me your ideas or suggestions.