code:

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$WMI = "WINMGMTS:{IMPERSONATIONLEVEL=IMPERSONATE}!//@WKSTA"
$WMI_NETWORK_1 = "SELECT * FROM WIN32_NETWORKADAPTERCONFIGURATION WHERE IPENABLED='TRUE'"
$NetCards = GetObject($WMI).ExecQuery($WMI_NETWORK_1)
  

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code:

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Physical Address. . . . . . : 00-08-C7-29-0D-DE
 
it is a NIC physical address.  They are divided into 2 parts, 6  characters each.
the first 6 are reserved by manufacturer, the second 6 are the unique Id
 
C:\>arp -a
 
Interface: 164.51.34.85 on Interface 2
  Internet Address      Physical Address      Type
  164.51.34.1           00-00-0c-31-c1-7f     dynamic
  164.51.34.10          00-08-c7-56-b1-35     dynamic
  164.51.34.20          00-08-c7-05-fa-8e     dynamic
  164.51.34.21          00-08-c7-da-f7-17     dynamic

by examining the arp cache on your machine or from other places you can see what the manufacturer 
of the nic is in each machine, which in our environment means we can know what type of PC it is.
 
00-08-c7    is the nic in Compaq deskpro
00-02-a5    is whatever it is in the Axx servers
00-10-a4    is Xircom realport
00-60-b0    is HP JetDirect
00-60-97    is 3com
 
What you can do with it is vague... besides trying to impress other geeks... You certainly couldn't 
pick up any girls with this stuff.  " hey baby, did you know 0060b0 is the manufacturer Id of jet 
direct cards.  Hey where are you going???"

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