Thanks for your super fast respond. I have 95, NT, 2000 workstations. Single Nics in almost all cases, no virtual network in place or RAS connections. Sometimes I get a blank string from @address. In other cases I get IPs 1.0.0.1 when my network is a 172.27.x.x.
Take a look at this:

Ethernet adapter ZZPGPMacMP2:
Description . . . . . . . . : RTL8139(A) Based NDIS 5.0 driver

Physical Address. . . . . . : 00-10-B5-41-D6-34

DHCP Enabled. . . . . . . . : Yes

IP Address. . . . . . . . . : 172.27.21.213

Subnet Mask . . . . . . . . : 255.255.252.0

Default Gateway . . . . . . : 172.27.20.10

DHCP Server . . . . . . . . : 172.27.20.102

Primary WINS Server . . . . : 172.27.xx.xx

Secondary WINS Server . . . : 172.27.86.101

Lease Obtained. . . . . . . : Monday, September 23, 2002 6:29:47 PM

Lease Expires . . . . . . . : Tuesday, October 08, 2002 6:29:47 PM

Ethernet adapter ZZZPGPCfg3:
Description . . . . . . . . : PGPnet Virtual Identity Adapter

Physical Address. . . . . . : FF-FF-FF-00-00-00

DHCP Enabled. . . . . . . . : Yes

IP Address. . . . . . . . . : 0.0.0.0

Subnet Mask . . . . . . . . : 0.0.0.0

Default Gateway . . . . . . :

DHCP Server . . . . . . . . : 255.255.255.255

Why isn't @address getting the MAC from the active connection?