Either tt(NOTRANS) or tt(mancommand) can be used to send man commands to the
output. 

E.g., the following code sends a MAN command tt(<hr>) to the output file when 
in MAN mode:
        verb(\
    COMMENT(-- alternative 1, using mancommand --)
    mancommand(<hr>)
    
    COMMENT(-- alternative 2, using NOTRANS --)
    IFDEF(man)(
        NOTRANS(<hr>)
    )()
        )
