DIAMOND: A Framework for Dividing Interfaces Across Multiple Opportunistically aNnexed Devices

Despite the increasing prevalence of physically proximate computing devices, current interfaces remain largely lim-ited to single computing devices because of the prevailing assumption that interfaces can only draw on input and out-put (I/O) resources attached to the same device. That as-sumption has led previous research to emphasize transfer-ring interaction to the computer with the best available I/O resources, but that approach introduces security and pri-vacy risks. We propose to instead allow users to divide interfaces across multiple devices so that they can allocate functionality and information appropriate across trusted and untrusted devices. In this paper we identify require-ments for a framework to effectively support the creation of divisible interfaces; we describe DIAMOND, a frame-work meeting those requirements; and we present example applications that we built with it. ACM Classification: H5.2 [Information interfaces an