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  Description:
 
     Attempting to read data from an area of the heap which has not yet
     been written will result in indeterminate data being returned to the
     buffer.
 
     See ◄Introduction to heap routines►
 
  Parameters on Entry:
 
     heap-id                 This contains the heap handle assigned when
                             the heap was opened.
 
     heap-ref                Offset in heap at which to start reading.
 
     heap-len                Number of bytes to read.
 
  Parameters on Exit:
 
     heap-buf                Buffer into which bytes are read. It is your
                             responsibility to ensure that the buffer is
                             large enough to hold the number of bytes
                             being read.
                                    -♦-