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     This Virtual Device Driver is used for sharing devices by connecting serially using COM ports. It helps programmers who works with COM ports which is united by a null modem cable. This tool automatically makes invaluable if the program requires more than two COM ports. Sometimes expansion card is required for the users to connect multiple ports using corresponding number of null modem cables to link the ports, on that situation VSD is used. This tool supports upto two hundred virtual COM ports.