Etelos has released a limited beta that provides access to offline data -- a chief requirement for any on-demand vendor. The feature, called "Apps on a Plane," allows any browser-based application from the Etelos Marketplace to exchange data with any other AOP-enabled app. Last year, the firm announced it would deliver an online-offline sync capability. Since then, it has been privately showing the prototype to developers and others in the industry. "What we have done is build a platform-agnostic distributed computing environment," CEO Jeff Garon told CRM Buyer.