How to detect MAC address and IP address

Hi,
I'm still student. I have my holiday project which i need to build a program to monitor the usage of instant messenger in a LAN system. I need to know how to detect the MAC address and IP address of a pc(no wireless using). Besides, i also need to find out the IM port. Please help me to improve my skill in java. (if ladies and gentlemen have any book. Please recomment to me).
Thanks
From,
lwfoon

http://onesearch.sun.com/search/onesearch/index.jsp?qt=get+mac+address&subCat=siteforumid%3Ajava31&site=dev&dftab=siteforumid%3Ajava31&chooseCat=javaall&col=developer-forums
http://onesearch.sun.com/search/onesearch/index.jsp?qt=get+IP+address&subCat=siteforumid%3Ajava31&site=dev&dftab=siteforumid%3Ajava31&chooseCat=javaall&col=developer-forums
You get the idea.

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