Library /sys$common/syshlp/PCA$HELP.HLB  —  CANCEL  WINDOW  Examples
  PCAC> SHOW WINDOW SMALL
  window SMALL at (1,2,1,80)
  PCAC> CANCEL WINDOW SMALL
  PCAC> SHOW WINDOW SMALL
  window(s) not defined

      Above, the CANCEL WINDOW command is used to cancel window
      SMALL, which was previously defined with the SET WINDOW
      command.
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