Running Something as the “Currently Logged-in User”

This is really difficult, and usually impractical.

Second, as a multi-user OS, Windows’ job is to maintain a strict firewall around each user’s process space. You don’t want one user jumping into another’s space, because that would be a huge risk to security and stability. So you can’t easily log in as one user and run something that another user can “see.”

With very few, difficult exceptions, you can’t really run something “as another user on a remote machine.” One exception is if you know the remote user’s user name and password. If you do, you can establish a Remoting session to the computer using their credentials, and potentially have applications run in that user’s process space. But you can see how impractical that is in most situations.