A novel interactive technology developed by Microsoft and first unveiled as a prototype last year has popped up in the real world. Microsoft Surface, described as a surface computer, is a 30-in. (diagonal) table-like display that allows an individual or multiple users to access content by touch or gesture, with no mouse or keyboard required. The technology began appearing in selected AT&T retail stores in April and made its debut at Harrah’s Rio All-Suite Hotel & Casino, Las Vegas, in June.