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overflow pdl

   pdl is full.  If you don't have one and too many things get
   pushed, you forget something.  The overflow pdl for a person's
   memory might be a memo pad.  This usage inspired the following
   doggerel:


     Hey, diddle, diddle
     The overflow pdl
        To get a little more stack;
     If that's not enough
     Then you lose it all,
        And have to pop all the way back.
                                    --The Great Quux


   The term pdl seems to be primarily an MITism; outside MIT this
   term is replaced by `overflow stack'.