Library /sys$common/syshlp/HELPLIB.HLB
COBOL, ENVIRONMENT_DIVISION, I-O-CONTROL, window-ptrs
 *Conan The Librarian 

  is an integer from 0 through 127.  Its value can also be 255.  It
  specifies the number of retrieval pointers in the window that maps the
  disk file.
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