Is it your own program?  If it isn't, do you have the permission of the original coder to go in and mess with the code?

If it is your own, or an open source one giving open permission, there wouldn't be a problem. However, Someone just hacking into a program's code and changing it without the creator's permission isn't allowed so far as I know.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi