Fact: There is 
internal, integrated WiFi (801.11b/g/n) in my PC, Notebook PC, Router, Mobile Phone, etc., etc. - but 
not in my new X10 Audio System  
Of course, one can use a USB WiFi dongle (as suggested by Cocktail Audio) but there are only two USB (2.0) ports on the X10. Using one of them for a WiFi dongle reduces the USB ports with 50% of the availability...
The (future...?) internal, integrated WiFi (801.11b/g/n) radio (and antennas!) should support 
WPA2 for secure access and WPS for easy setup - Thanks!