VMS Help  —  PASCAL  Attributes  Allocation  AT
  The AT attribute specifies that VSI Pascal allocates no  storage
  for  the object (storage has already been allocated) and that it
  resides at the exact, specfied address.

  Syntax:

     AT( n )

  The exact address is specified by  the  constant  expression  n.
  Variables representing machine-dependent entities are frequently
  given the AT attribute.

  See the "HP Pascal Language Reference Manual" for  the  complete
  description of using the AT attribute.
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