How can I do a subscription probe on my lists?  I can't seem to find
anything about subscription probes in the owner's manual.  :(
 
   (\__/)  .~    ~. ))
   /O O  ./      .'             Patrick Douglas Crispen
  {O__,   \    {               The University of Alabama
    / .  . )    \                [log in to unmask]
    |-| '-' \    }           http://ua1vm.ua.edu/~crispen/
   .(   _(   )_.'
  '---.~_ _ _&                    Warning: squirrels.