Net config server or Net config workstation will return valuable NT information about a machine.

nbtstat Displays protocol statistics and current TCP/IP connections using NBT
(NetBIOS over TCP/IP).
winipcfg  (The Ip config GUI utility)
ipconfig  (The ip config utility in Win 2000- non GUI)
winmsd  for NT Diaganostics
windisk  starts the disk administrator tool
ntipcfg
netstat a or netstat-ar will tell you open ports on that machine
nslookup Connects you to a DNS server on the net for lookups of IP's and names

To find out the MAC address of a remote machine.

First ping the remote machine at the command prompt then type in arp -a. This will then show the IP address of the machine and its MAC address.

Note: if the machine is on a different subnet then you will only get the MAC address of the router.