Using PING, I can find someone's IP given their computer name (for example, my computer name is ChenF, and if I do "PING ChenF" it'll resolve my IP)...<BR><BR>...but ...

I think you need to supply more details...<BR><BR>Are you trying to do the name/ip lookup on some other machine than the one whose MAC address you have? <BR><BR>The translation between IP and MAC ...