old-display

    Specifies the display whose contents are saved. You can specify
    any of the following entities:

    o  A predefined display:

          SRC
          OUT
          PROMPT
          INST
          REG
          FREG (Alpha and Integrity servers only)
          IREG

    o  A display previously created with the DISPLAY command

    o  A display built-in symbol:

          %CURDISP
          %CURSCROLL
          %NEXTDISP
          %NEXTINST
          %NEXTOUTPUT
          %NEXTSCROLL
          %NEXTSOURCE

 new-display

    Specifies the name of the new display to be created. This new
    display then receives the contents of the old-disp display.