Library /sys$common/syshlp/PCA$HELP.HLB  —  SELECT  Qualifiers  /SOURCE
    If you specify a display, selects it as the current source
    display. This causes the output of all TYPE commands to go to
    that display. The display specified must be a source display.

    If you do not specify a display, the current source display is
    deselected and no display has the source attribute.
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