It's possible to use the gfxutil from the Netkas forums in the following manner to discover the address of certain hardware that is connected to computer:-

'gfxutil -f device'

This is also possible with the ioreg command but I don't remember the command off the top of my head.

My question is this. If I have two network interfaces, how do I use this command to discover the address of the second interface? When I try the command, I only get one of my devices to show.

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Mac OS X Leopard 10.5.7 (Retail)
Motherboard: MSI P6N Diamond
Processor: Intel Core 2 Quad Q6600 2.4GHz
Video Card: MSI NX 6600 TD256E (CI QE Dual Displays)
Memory: Corsair TWIN2X4096-6400C5DHX 4GB DDR2