DSR normally adds an extra space after any of the following
    punctuation marks in your text: period (.), colon (:), question
    mark (?), and exclamation point (!).

    The .NO PERIOD command cancels the extra space that DSR inserts
    after any of the punctuation marks listed in the previous
    paragraph. The .NO PERIOD command is used to differentiate
    between punctuation used as part of a sentence, and punctuation
    used as part of a DSR command.

    The .PERIOD command restores the routine insertion of an extra
    space following any of the punctuation marks listed in the
    previous paragraph.

    Formats

      .PERIOD

      .NO PERIOD

    Abreviated formats

      .PR

      .NPR