I have 2 pages: item_list.xhtml and item_detail.xhtml. User can modify the item 
detail when clicked a link in item_list page. In item_detail page, user 
modifies the item details and submit the changes by triggering 
myItemAction.submitChange(). Once the changes have been made, the user will be 
directed to item_list page again. In the submitChange() method, we can simply 
return a string that pointed to item_list page. This approach is OK in this 
case.

In some cases, there might be multiple entrances to item_detail e.g. 
item_feature_list.xhtml, item_history_list.xhtml...  In the submitChange() 
method, things are not that easy anymore because we don't know what page we 
should go.  Is there anyway to return to something like 
"where_I_came_from_previously". 

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