In pervasive environment, users access their enterprise applications using heterogeneous devices. However accessing complex applications is time consuming on devices with limited capabilities. Moreover, the communication between these applications is a frequent and valueless action which is currently managed by the end-user himself, by getting data from an application and putting it into another. In this paper we propose a web based framework for application integration. This framework first hides the heterogeneity of accessing devices from the service providers and then facilitates the usage of enterprise applications, by enabling simple communication (e.g. by drag&drop) between independent and heterogeneous services. We rely within this framework on the widget concept, where a widget gives access to a single functionality of an enterprise application. This enables to reuse the widget user interfaces in various contexts.