TTY_DEFCHAR3 allows a user to set a bit so that the OpenVMS
    terminal driver remaps CTRL/H to Delete. VSI recommends that
    you not set this bit as a systemwide default.

    Characteristic Value (Hex)   Function

    TT3$M_BS             10      When this bit is set, the OpenVMS
                                 terminal console remaps CTRL/H to
                                 Delete.

    For more information, see the SET TERM and SHOW TERM commands in
    the VSI OpenVMS DCL Dictionary.