POC

from The Free On-line Dictionary of Computing (8 July 2008)

Point Of Contact
POC

   <networking> (POC) An individual associated with a particular
   {Internet} entity ({IP network}, {domain}, {ASN}).

   (1998-09-07)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

POC
       Proof of Concept

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

POC
       Push to talk Over Cellular (GPRS), "PoC"