I have been reluctant to accept the fact of "No Internet, no remote control" so I reached back to my trusty software program used years ago in the simulation world. The program is Real VNC [www.realvnc.com] and this program allows remote control of any platform Mac or PC from just about anything else. Real VNC can be configured to run over the wireless network only and be password protected for complete safety.
You can log into the Proclaim software on an internet connection and then disconnect the internet. Start Real VNC Server on the main computer and Real VNC Viewer on the remote device. Once connected you have complete control of the desktop. No more worries about outside influences as Real VNC has been years battle tested.