Dear Aileen,
Thank You for the reply.
It happens when I open notepad in my desktop.
If I open lots of notepads at a time ,I might forget which ones I had opened previously.
The problem is I will hibernate the system and when I come back the next day, I might open the same note pad again from the desktop.
So now we have two instances of the same notepad.
Then I might accidentally make changes in both of them and won't know which one to save.
I would be really grateful, if you could solve this issue.
Hope that is clear.