FIG. 1A shows a DSDN 100 (also call “network 100” herein) connected to the internet 190 and including exemplary subnetworks 120-180 (also called “l(fā)imited access networks”), a router 106, a primary interconnected device 102, and a secondary interconnected device 104. Primary device 102 is pictorially represented as connected to subnetwork 120—subnetwork 160 via router 106. Subnetwork 120 includes four computer systems 121-124. Subnetwork 130 includes a smart thermostat 131, a smart AC unit 132, a smart furnace 133, and a smart hot water heater 134. Intelligence in these (and any other) devices may be integrated upon manufacture or may be added as an add-on post manufacture. Subnetwork 140 includes a smart TV 141, an A/V receiver 142, and an amplifier 143. Subnetwork 150 includes smart light bulbs 151 and a smart hub 152. Subnetwork 160 shares smart hub 152 with subnetwork 150 and includes IoT enabled door 161, and window 162. Any of these devices may include a plurality of IoT or smart devices, for example door 161 may include a smart lock, a smart doorbell, and a smart door opening sensor. Subnetwork 150 and/or subnetwork 160 may also include other smart or IoT devices such as smart light and fan switches, motion detectors, security cameras, moisture detectors, window shades, weather stations, etc., all of which are not shown but are contemplated. Subnetwork 170 includes a computer system 171. Subnetwork 180 includes a guest device 181, such as but not limited to a guest smart phone, guest computer system, or guest tablet.