Process owner username needed

[this-is-me 4]

I need to have the a function like ProcessGetUserName($PID) to check if a process has been run by the system or by a user. I have found the following information on how to do that (of course it won't work on 9x):

http://support.microsoft.com/default.aspx?...kb;EN-US;111544

I have no experience in C++, so I don't know if that is the information you need to make this change. Is this a viable option?