Recommend Eltima Serial Splitter CE 2.6

Serial Splitter CE splits real serial ports into virtual ones. It is really useful if you need several applications to work with the same serial port on your mobile device (several apps to read from one GPS device). With Serial Splitter CE one program works with one virtual port, the other one with another port, etc., but in fact all of them work with the same split real port. You can create up to 20 equal virtual ports for splitting real ports.