The .SUBTITLE command allows you to specify a subtitle for a
    running head (see .HEADERS ON). When using the default .LAYOUT
    command, the subtitle appears on the second line of every page
    (except page 1) at the leftmost position on a line (character
    position 0), regardless of the left margin setting. The .NO
    SUBTITLE command cancels the .SUBTITLE command. (See also
    .AUTOSUBTITLE, .TITLE, .FIRST TITLE, and .LAYOUT.)

    Formats

      .SUBTITLE  [text]

      .NO SUBTITLE

    Abreviated formats

      .ST  [text]

      .NST