How to get Machine Remote Client information

Access to the network host mac address,CPU access to suppliers,...
http://www.hackchina.com/en/cont/82131

Three ways to get your MAC address.
http://www.codeguru.com/Cpp/I-N/network/networkinformation/article.php/c5451
Enterprise Logging for Distributed J2EE Applications
http://javaboutique.internet.com/tutorials/logging/index4.html

How do I get MAC address of a host? (JAVA)
http://www.kodejava.org/examples/250.html
Extract network card address(JAVA)
http://www.rgagnon.com/javadetails/java-0369.html

References:
http://mindprod.com/project/macaddress.html