Dex is more important than ever with the upcoming web client. Now you can attend Dexterity Training in Orlando, Florida, USA (8th to 12th October 2012)
Dexterity Training in Orlando, Florida, USA (8th to 12th October 2012) – Developing for Dynamics GP – Site Home – MSDN Blogs
Development & IntegrationMicrosoft & the GP Ecosystem
Archived post from 2012. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.