The AAFO, once built, is added to your Access App via an HTML i-frame element on your forms. AAFOs can be published to the Microsoft Store for public facing solutions, or administered on your company's SharePoint site for internal solutions.
To develop AAFO, we can use Visual Studio 2013 with the Microsoft Office Developer Tools for Visual Studio 2013 - March 2014 Update
(direct download link
For a brief introduction to Apps for Office, take a look at this interactive API tutorial: http://msdn.microsoft.com/en-US/office/dn449240
(excel based, but good for an intro)
Members of the Access Team recently presented AAFO to the SharePoint Conference. Videos of these presentations are listed below:
SPC204: Anyone can build a SharePoint App with Microsoft Accesshttp://channel9.msdn.com/Events/SharePoint...nce/2014/SPC204
Jeff and Chris Usher
SPC338: The 'how to' guide for selling and managing SharePoint Apps built using Accesshttp://channel9.msdn.com/Events/SharePoint...nce/2014/SPC338
Bob and Kevin Bell
SPC335: Rich extensions to SharePoint Apps using Microsoft Accesshttp://channel9.msdn.com/Events/SharePoint...nce/2014/SPC335
Gary and Arjun
SPC 348: Update on InfoPath and SharePoint Formshttp://channel9.msdn.com/Events/SharePoint...nce/2014/SPC348
Greg, Bob, and Sonya
And finally, a group of early testers were keeping some notes on AAFO and general development practices. These notes will be progressively migrating to a new portion of UA's own Access Wiki. Keep in tune and start learning how to develop custom controls and services for Access Web Apps!