trying to receive a page form, page1, ask submitter to verify 'for sure' on page2 (redirect from page1), page2 form calls page1 (action=page1) with answer.
in page1, page_load, I'm checking for to see if first time, or submitted form or coming from page2, (which should be previous page? yes?) but any reference to 'previouspage' results in 'Object
reference not set to an instance of an object'
I have set 'previous page type' with the virtual path to the previous page in the page1 parameters
so not getting how to determine if page invocation is done
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