BMI Cable - Splitting Feed

[Ron Augustine <RonAug@xxxxxxxx>]

Does anyone know the procedure for splitting the serial port feed coming out
of the BMI cable box and sending it to a second computer?  There are "Port
B" and "Port C" serial connectors on the back of the box -- are these
duplicates of "Port A" and therefore could be used to split the feed?
   
If not, does anyone know if a wire-for-wire serial cable or adapter is
available for splitting the feed from "Port A" to a second serial port?
    
TIA--