/sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  SHOW  MARGINS  Description
    The current margin settings are the margin settings last
    established with the SET MARGINS command. By default, if you
    did not enter a SET MARGINS command, the left margin is set to 1
    and the right margin is set to 255.

    Related command:

       SET MARGINS
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