My PowerBook hanged. What a surprise !

For the first time, my new PowerBook hanged unexpectedly after few weeks. It might have caused by memory leaks. I am not sure if my toting of the notebook back and forth between home and office networks without shutting down might have caused confusion to the machine and be part of the problem or not. Luckily I saved my files often and I did not lose anything. Had I left opened a terminal before it stopped responding, I could check to see if I could kill some troubling process and avoid hard shutdown. That is a Unix way.