Saving a value in a var forever?

Hi guys...

Is there anyway to save a var value forever?

Like... let´s say I have this:

private var b:int;

private var xb:int;

public function UPD()

                    {

                              start()

                    }

private          function start():void

                    {

                              //add a button to do something

                              //add a button to do whatever

                    }

//define the listener for the buttons (MouseEvent.CLICK, something & MouseEvent.CLICK, whatever)

private function something(e:MouseEvent):void

                    {

                              if (!b){b = (1 + xb);}

                              //another function to do something else after adding b + xb

                    }

private function whatever(e:MouseEvent):void

                    {

                              xb++

                    }

This way xb (and b) will have 1 more each time I click on the whatever button...now let´s say I close everything...how can I have the values I had before, back, when I open it again, so xb doesn´t start from 0 again, but it keeps the clicks from previous time?

Thanks a lot!!!