How do I give a user RDP or VNC access to a resource without giving them any password permissions

How do I give a user RDP or VNC access to a resource without giving them any password permissions

I am new to PMP and I have a couple of domain users who use VNC to connect to a handful of servers to start and stop processes. I setup VNC on those servers, but I am not sure how to give those users access to those machines without giving them access to passwords on those resources. I tried to Share, but the only options there are view passwords and modify passwords and I don't want them to have any of that. Is this done through Access Control rather than Sharing?

Thanks,
 Kenny
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