raser,
HKCU is not a 'real' hive. It is smoke and mirrors. If you open any remote registry, you can see for yourself.
I don't know how to tell who is logged on through a reg peek. Perhaps someone else on the board can enlighten. I use NBTSTAT to tell me who, if anyone, is logged on to a particular PC.
Have you thought of using SU to do reg mods? See http://kixtart.org/board/Forum1/HTML/002502.html

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Laziness is the mother of invention.

Les Ligetfalvy

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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.