/sys$common/syshlp/helplib.hlb SET, HOST, /DTE, Qualifiers, /BREAK  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /BREAK=break-character

    Selects the break character. The break character is used to
    generate a break on lines that expect a break rather than a
    carriage return. To generate a break, press Ctrl/break-character.

    The break character can be any ASCII character between @ and
    z, except C, M, Q, S, Y, or the left bracket ([).  You cannot
    select a character currently defined as either the command
    character (see the description of the /COMMAND=command-character
    qualifier) or the escape character (see the description of the
    /ESCAPE=escape-character qualifier).

    The ASCII characters between @ and z include the alphabetic
    characters in both upper and lower cases, the at sign (@),  the
    backslash (\),  the right bracket (]), the circumflex (^),  the
    underscore (_),  and the grave accent (`).

    By default, the break character is the right bracket (]).