jac:
In your Win8 system just start typing in Remote Desktop Connection (you may have to be in the Start screen). There may be several options but I use this. You will be prompted for the name of your Win 7 system so you may want to look that up before hand (Control Panel : System : Computer Name). Enter the name of your Win 7 computer when prompted. You may be asked for credentials (User name/Password) if you have them set up.
I usually get a warning about the Certificate from the host not being valid but I answer to "Go Ahead and Do It". At that point you should be in and your Win 8 station will be controlling.
I haven't noticed any latency issues but as I mentioned I use it more as a remote control for hitting the "Record" button from a remote room. The Surface is a bit smallish but I could use it for mixing if I wanted I suppose. It can be used to drive The Matrix View (that's for the OP).
This is not difficult to accomplish so you should just give it a try and see if it works for you. In my opinion any monitor smaller that 23" is probably going to be somewhat ineffective but that's just my opinion. YMMV.
Regards,