I have just installed the essentials role on a VM. When you run the connect program from a workstation (http://
<local domain>/connect) you can set which users can use this workstation and it appears then gives them local admin rights on that workstation. I cannot work out (having spent a lot of time on google trying to find out) how you can subsequently add or remove those users.
The only way I can find to do it is to run connect again on the workstation and either change its name or remove the computer account from AD (through the essentials dashboard).
I cannot believe that there is not a simpler way of doing this and I must be missing something blatantly obvious. The only machine setup I can find in the users account in the dashboard is to say which computers the user can be remote controlled.