counter_bump
     counter_bump — 
      Update the current value of the basic counter.
     
     
    
     Description
     
      void counter_bump
       ( integer $offset
      )
     
      counter_bump() updates the current value of the basic
      interface's counter.
     
     
    
     Parameters
     
      - 
       offset
       
- 
        
         The amount by which to change the counter's value. Can be negative.