Same machine - many MAC and IP addresses.  How can this happen?

Both my machines show (on WakeonLan) as having more than one IP address and MAC address. This resulted yesterday in my wife's Windows laptop which had a fixed ip address not working because the IP address had recently been adopted by the iMac.
How can this happen please and can I clean it up?
iMac and MacBook Pro   Mac OS X (10.4.9)  

Launch System Profiler in /Apps/Utils/ and see what it says.

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