Diving into GPS development

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Hello, I need some suggestions from a GPS-hare! I am starting to implement GPS into my app, which is running same time as a navigation system is running, thus it has to share the gps port, whatever it is made of (serial, bluetooth, usb and so on). I saw one can use the commercial solution "Franson GPS Gate", which provides "virtual ports" by taking the original signals and then forwards them to its emulated ports. So here is my first question: Is there any way to emualte such a port myself, i mean, grab the signal from the port and provide a virtual port from within my app, so the navi-soft gets its signal from MY app? And another question I have: Can anyone suggest some mfc classes encapsulating the NMEA protocol? Thank you very very much! Martin