tw_MdInit( nBaud )
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     Initializes the modem. In this version of TSDWIN, the modem is
     initialized with 8 data bits, 1 stop bit, no parity. For simple
     dialers, there is no need for anything more.

       Arguments:

     nBaud - 'N' 1 -   110 baud
                 2 -   300 baud
                 3 -  1200 baud
                 4 -  2400 baud
                 5 -  9600 baud

       Return:

     NIL

       Example:

     tw_MdInit( 300 ) Initializes the modem at 300 baud.