It depends how you want to display the data and what your intentions are.
On the full-solution end of the spectrum this is what an HMI/SCADA system does for you (www.inductiveautomation.com, for example).
On the roll-it-yourself end of the spectrum it sounds like you just need to continually poll the gateway for the registers you're interested in and maybe display it on a webpage.
Where do you land on this spectrum?