4.6. Values not transmitted from CGI
The following variables are never copied from CGI:
mv_todo
mv_todo.submit.x
mv_todo.submit.y
mv_todo.return.x
mv_todo.return.y
mv_todo.checkout.x
mv_todo.checkout.y
mv_todo.todo.x
mv_todo.todo.y
mv_todo.map
mv_doit
mv_check
mv_click
mv_nextpage
mv_failpage
mv_successpage
mv_more_ip
mv_credit_card_number
mv_credit_card_cvv2
You can define more with the FormIgnore catalog.cfg directive.