The .DISPLAY SUBPAGE command allows you to specify the form that
    sequential lettering (or numbering) of subpage characters will
    take. Subpage characters are the characters that are appended to
    the page numbers of subpages. This command does not change any
    values; it affects only the way the values are displayed. (See
    also .SUBPAGE and .NUMBER SUBPAGE.)

    Format

      .DISPLAY SUBPAGE  y

    Abreviated format

      .DSP  y