You will be in need of this trick sometimes in ur life with computer.
Think a situation ..
You copied image files fromy your camera to ur pc.Their name will be defaultly set by the camera.But to store it.You may sometimes like to rename it with name you wish.But renaming such large number of files is not a easy task.
Do you ever gone through such a situation? Then this is a perfect trick for you.You can rename multiple files at once.
Select all - ctrl+a
press F2 - rename
type name
press enter
And you have made it.
This is a simple but handy trick to help you when you may in need for multiple file renaming.