[GD-Windows] Getting an user's security details

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Hey all,

I'm developing a cron-like service for win2k and above and I need to run =
processes as different users (not as .\LocalSystem). The problem I'm =
having is that I don't know how to find out an user's password in order =
to log on as that user and run commands in his/her security context. =
I've searched MSDN for about four hours and I couldn't fnd any good =
information regarding this.

Thanks in advance,
Adrian