Set custom colors for ONE particular window

Question

Hi, I often need to compare two files, say a "good, or sample" one, with a "bad, or in preparation".
They both have the same name (like web.config CV.docx, MyClass.cs), so when I visualize them, I cannot distinguish easily whioch is which.
For example, I see two notepad instances displaying "web.config" in title bar, which is which?
Of course I could rename them, but I only want to view, not to modify anything, as that could be dangerous (oops! renamed wrong web.config)
I tried to create two users "bluethemeuser" and "greenthemeuser", then shift run as different user, but this is tedious, and does not work (does not honor other user settings).
I am loking for a way to tell a window "now you have a blue background until you are closed"
any idea?

Answer 1

Having a tag or a post-it, or even a spider ;-) in the window would be just as good.
In IE you can use the Developer Tools to change the Title, which would change the Tab label.  F12, Ctrl-2,  document.Title="Demo"   In IE11 we even have IntelliSense to reduce the amount of keystrokes.
Coincidentally I recently discovered a tool on the Windows SDK called
Inspect.exe.  If you could find a way of extending that perhaps you could give any window any title you wanted?  Or add notes to hidden fields?
Heh.  For my Demo tab.  Inspect says there could be Other Props:  I wonder how?
Robert Aldwinckle