I have three NUC size PC running W7, each one hook to a 50” TV with HDMI cables. They in turn are on a Netgear switch that goes to a Netgear GB wan, Lan, wireless router, that goes to a Comcast cable modem Lan connection. On that network I have a mid-tower PC with W8.1 that I want to use to access the three small machines, that are being use to display menus in a restaurant, so the menus can be change when needed. How do I log onto those computers from that machine?