Purchasing power parity (PPP) is an economic theory that states that the exchange rate between two currencies is equal to the ratio of the currencies' respective purchasing power.
MAC Address Generation. Each virtual network adapter in a virtual machine is assigned its own unique MAC address. Each network adapter manufacturer is assigned a unique three-byte prefix called an Organizationally Unique Identifier (OUI), which it can use to generate unique MAC addresses.
By Preston Gralla, PCWorld. Every network adapter has what is called a Media Access Control address that uniquely identifies it. Think of it as an ID. Having to manually go to every computer on the network, and taking the time to run tools to find out every device's MAC address is extremely time-consuming.