The following are the major differences between product cost and period cost: 1  Product Cost is the cost which can be directly assigned to the product. 2  Product Cost is based on volume because they remain same in the unit price, but differ in the total value.
Communication protocol. In computing, a protocol or communication protocol is a set of rules in which computers communicate with each other. The protocol says what part of the conversation comes at which time. It also says how to end the communication.
PPTP (Point-to-Point Tunneling Protocol) is a network protocol used in the implementation of Virtual Private Networks (VPN) .PTP works on a client server model. PPTP VPN clients are included by default in Microsoft Windows and also available for both Linux and Mac OS X. Newer VPN technologies like OpenVPN, L2TP and IPsec may offer better network security support, but PPTP remains a popular network protocol especially on Windows computers.