I might buy AFP Pro, the interface version.. I don't have a Tx yet for my models and my computer isn't equipped with a game port... only USB and serial ports..so, if I get AFP, could I use a RealFlight USB controller with it by chance...?

Yes you can use the Real Flight controller with AFP.

ok, so i install AFP, I plug the RealFlight USB controller into a USB port, and AFP will recognize it?

I'm running Win2K here, and the only way I could have a game port is if I installed a separate sound/game card.

You must still have to plug in the Interface that comes with AFP. Just wind it up.