I wrote a bunch of programs to be used as a shopping cart for a customer of mine. It seems to work fine most of the time, but there is apparently a small problem. When a customer adds an item to their shopping a program adds writes the necessary data to a file and then refers the browser to a program that displays the current contents of the shopping cart. The problem is that some customers are getting a cached version of their cart and have to click refresh to see the updated version after they add an item. I have never experienced this problem directly and know nothing of the browser version or settings of the people having this problem.
Is there any way to force a browser to display the current version of a page?