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

1  –  Parameter

 y

    One of the following one- or two-letter codes:

    Code     Form of Sequence and Case

    D        Decimal numbers
    O        Octal numbers
    H        Hexadecimal numbers
    RU       Roman uppercase numerals
    RL       Roman lowercase numerals
    RM       Roman mixed case numerals - only first numeral is
             uppercase
    LU       Letters, uppercase
    LL       Letters, lowercase
    LM       Letters, mixed case - only first letter is uppercase

2  –  Default

    Uppercase letters (LU) appended to the page number preceding the
    subpage