Cases where processes will be used and where threads will be used

Hi all,

In which cases we have to use creating processes and in which cases we have to use threads ?

Please clarify me in detail.........

Thanks in advance,
Aravind.

http://www.cafeaulait.org/course/week11/02.html
http://www.informit.com/articles/article.aspx?p=169479
http://wiki.answers.com/Q/What_is_th...ess_and_thread
http://www.cs.berkeley.edu/~istoica/...ProcThread.pdf

Good luck