I know this is an odd request, and may seem inappropriate. I can assure you that I own the system I want to do this to. The reason is simple- we have a "children's PC", but the children prefer my PC as it's much more powerful. My SO gets upset if I don't allow the children to use my PC when I'm not using it. I'd prefer that they don't touch it as they have their own. So there you have it- I'm not looking for interpersonal relationship advice, but just a way to make my PC less desirable (slow) when they're logged on it. *edit- to clarify a bit, usage is pretty much limited to youtube / playing flash games. Perhaps some sort of bandwidth throttling is the best way to go?