Check this out:

http://www.forbes.com/technology/2004/03/16/cx_ah_0316chips.html

A company titled Vocera has created a very Star Trek:TNG-like com badge for use in hospitals etc. From the article, this is how it works:

With the Vocera badge, a nurse needs only to hit a button and say the name of a doctor. The request goes over the hospital’s wireless network to the server, which then locates the appropriate doctor and delivers the message more or less instantly. If the doctor is available he or she can respond right back. If not, the nurse can ask for another doctor, by name or by specialty. Say “I need an anesthesiologist,” and the server finds the nearest anesthesiologist and connects him.

Now when this works anywhere in the world, I’ll be impressed!