Ken
I think you mean the EXIF data...
I use this program to modify EXIF data on my photo images because some of the programs i use don't keep the EXIF data intact and I find months later that I need it and it's gone...
This program also allows you to backup the EXIF data and then reattach it to the image once you are finished with it.
Exifer for Windows
It is a small and free download (at least it was when I got it).
There are also a number of plug-ins for Photoshop that allow you to edit EXIF data but i seldome have a need to edit it, only restore it so I don't have first hand experience with these.
Also, Paintshop Pro 8.0 and maybe later version allow you to edit the EXIF data directly.
Hope this has been helpful! Good Luck!
Mike.