VMS Help DSR, DSR Flags, Accept  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The Accept flag (_) causes any character that directly follows it
    to be accepted as text.

    If the character is a punctuation mark after which DSR normally
    inserts an extra space (for example, a period), you can precede
    it with the Accept flag to cancel the extra space.

    If you want to insert a flag character into your text, the
    easiest way is to precede it with the Accept flag. For example,
    to insert an ampersand (&), which is also the Underline flag,
    type _&.

    For underlining purposes, you can use the Accept flag to cause
    the acceptance of an expandable space (one you produce by
    pressing the SPACE bar) because DSR normally does not underline
    spaces between words.

1 - Default

    Recognition is turned on.