Browser Navigation Buttons ("Back", "Forward") versus UI navigation buttons.

Sometimes the browser navigation button "BACK" for instance, do not go back one screen. Why is this?
The UI has a back button that DOES go back one screen.
What's the difference between the browser back button and the UI back button. Sometimes the browser back button DOES bring you to the previous screen, other times it'll generate a white screen or "page expired" message.
See graphic for an example of UI versus browser.err
brothertruffle880Asked:
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Scott Fell, EE MVEDeveloper & EE ModeratorCommented:
What is probably happening is each page requires some specific data to be passed in order to get loaded.  Page 1 will pass data to page 2. When page 2 loads, the data required to load page 1 is lost.  If you use the UI back button, that button will contain a link or act as a form that posts to page 1 that is required for page 1 to load.   However, if you just use the browser's back button, you are not passing the required data so you get the error the page can not load.
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brothertruffle880Author Commented:
That makes sense.  Thanks and have a great New Year!
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