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Hopefully, you meant something else :)
Which still leaves the follow-up questions: Do you mean you want to prevent someone from sitting down at your desktop and being able to use this equipment? Or do you mean you want to prevent others on the same local area network from using them? If it is the former, then I think the only option is restricting use to the machine via a desktop password. If it is the latter, then disable Microsoft File and Printer sharing.
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