saajha jyu, here is more addendum to your remarks for VMWARE and how it works http://en.wikipedia.org/wiki/VMware now... you can hyperthread the processes. this is to fool the kernel. this is after the kernal is loaded. you can as well load the kernal multiple times and that is possible. for novice users here is how you can change your lilo conf for loading multiple kernel in the same machine and how to load it separately as well....... http://www.linuxforums.org/forum/redhat-fedora-linux-help/32341-multiple-kernel-possible.html I am not talking about memory leaks by application. i am sure you are aware of windows OS not freeing up stacks of registers after it gets loaded.