Say you have three pages, a search page, a results/master, and a detail
page.
You choose parameters on your search page and submit the page.
The results show in the reults/master page.
You click one to go the details page.
You hit the browser button to go back and it shows the results/master page
but shows "Page has expired" error.
How can you prevent this? How can you show the results page whether you get
there forwards or backwards?