Co-operative ventures among libraries to purchase and share materials. PoP - (Point of Presence, also Post Office Protocol) - are two commonly used meanings. A ‘Point of Presence' means a city or location where a network can be connected to, often with dial up telephone lines. So if an Internet company says they will soon have a POP in Orangeville, it means that they will soon have a local phone number in Orangeville and/or a place where leased lines can connect to their network.