Determine Windows ComputerName only by IP address

To determine Windows ComputerName (DomainName) on linux when you only have IP address
you can call:
smbclient -L  ip_address
or
nmblookup ip_address

To get MAC address of the client's network card:
Linux (you need root privileges for that):
ping ip_address
arp | grep ip_address
Windows:
ping ip_address
arp -a
To determine you own IP address on Windows:
getmac
(it's a new command introduced in Vista)