%SystemRoot% The path where the operating system is installed.
10BaseT Ethernet LAN designed to run on twisted pair cabling. 10BaseT runs at 10 megabits per second. The maximum length for the cabling between the NIC and the switch (or hub, repeater, etc.) is 100 meters. It uses base band signaling. No industry standard spelling exists, so sometimes it’s written 10BASE-T or 10Base-T.
100BaseT Generic term for an Ethernet cabling system designed to run at 100 megabits per second on twisted pair cabling. It uses base band signaling. No industry standard spelling exists, so sometimes it’s written 100BASE-T or 100Base-T.
1000BaseT ...