With today’s release of Dynamics GP 2013 I’m also linking to the Web Client for Microsoft Dynamics GP 2013 Hot Topics page on CustomerSource. I know that this is a feature that a lot of people are interested in so you might as well start the research.
Web Client for Microsoft Dynamics GP 2013 Hot Topics
Install, Upgrade & AdminGP 2013
Archived post from 2012. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.