Here is how you can display the current user(s) logged into a remote Machine.

1. Click Start

2. Press "Run"

3. Type CMD

4. When CMD runs type in the following command without quotes and changing <computer system or ip> to the machine IP address or Machine Name:
"wmic /node <computer system or ip> get username"

5. Press enter

This should now display the users logged in to the current machine sessions.

Thanks
Kyle