Retaining webform's values when navigating back from another webform

i have two forms..
say webfrom1 containing 2 textboxes; 1 submit  button
      webform2  containing 2 textboxes 1 submit button 1 back button-(this button is used to navigate back to webform1).
Now can we retain the values of textboxes in webform1 when navigating back form webform2?
 
 
thanks....

 
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