mr ezwan, the pt2272/2262 are only ICs to help applications which are ON/OFF. I suppose if you're looking for data transfer, then you'll need better ICs.
The operation is very simple, for the pt2262, there are 4 inputs, any inputs which holds HIGH/ON, the output will also be HIGH/ON at the pt2272's end. If there are 4 switches, ABCD as input let's say, and 4 LEDs at the output of the pt2272, abcd as output for instance, then if you press B, b turns on. Press AC, LEDs ac turns on.
As for your application, you need to describe more on what are your plans, then I can give more input since I'm not sure what you really want.