Window Sales and Zip Codes

During the final push to curtain at each performance:

Do you use a "window sales" dummy account or do you create a new account for each person coming to the window to buy a ticket?

If you use a "window sales" dummy account do you try to capture any simple demographics about the person making the order.  For example zip code?  If you do record zip code how are you doing it? 

Thanks for sharing what you are doing