Using Automator to recall open Windows of (multiple) Applications
I do not know the effectiveness of assigning numbers to the windows, 

since I would forget who is who after the third window or after 5 minutes.

I use the cmd + tab to see the open windows and then select the one I want.

That works showing open windows by application, and to see them within the application like Chrome use the ctrl + tab.

But that's me, so let's hope someone will be kind enough to spend time writing the script for you since you asked so nicely.

This might be also something for you: http://support.apple.com/kb/PH11158