If I connect a USB DVD unit (e.g.) to the TBD I can access it through the TB cable (e.g. to a MBA). Fine. Is there a WiFi capability within the TBD so that I can access the USB DVD unit from the MBA even if not connected by TB cable ? If not, then can I connect an Airport unit to the TBD (LAN or USB) and access the USB DVD unit through the Airport unit ?