Sandeshtrivedi, nobody said you were trying to do anything wrong, just that you didn't provide some logical reason for wanting to know this information. As a relatively new member myself, I've learned (in some cases, the hard way) that you really should do your own research before posting here. Its not that the people around here won't help with basic stuff; quite the contrary, they're a very helpful bunch. Its just that they expect you to do some basic reading yourself.

As a fellow new person, I would suggest that Google become your new best friend. You might be surprised at what you can find with some crafty searches