The Network Everywhere Fast Ethernet Adapter (NC100) is a network interface card (NIC) that allows your computer to connect to a wired Ethernet network via a 100 Mbps (Fast Ethernet) connection. It was commonly used in older PCs or laptops, especially in the early 2000s, to enable Ethernet connectivity. The Windows driver for this adapter ensures that the operating system can communicate with the hardware and establish a network connection.