The .DISPLAY CHAPTER command allows you to specify the form that
    the numbering (or lettering) of chapters will take. The form you
    specify appears in the title, the page numbers, and the first
    character of header level numbers throughout the chapter. This
    command does not change any values; it affects only the way the
    values are displayed. (See also .CHAPTER and .NUMBER CHAPTER.)

    Format

      .DISPLAY CHAPTER  y

    Abreviated format

      .DCH  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

    Decimal numbers (D)