Abstract: A method comprising: (a) sending a signal from a first to a second application, specifying a request initiated by a first user for a predetermined action to be performed by the second application, the first signal including at least a conversation identification recognized by the first application as identifying a communication session between a group of users; (b) once the second application has performed the action, receiving back a second signal at the first application from the second application, comprising an asset provided by the second application as a result of the predetermined action, or a link to this asset, and further comprising a return of the conversation identification; and (c) based on the returned conversation identification, providing the asset or the link to the asset to one or more other users in the group via said communication session conducted through the first application.

Abstract: A first application invokes a first URI specifying a second application as the destination of the first URI. The first URI contains a return URI specifying the first application as the destination of the return URI, and the first URI further specifies an action of returning data from the second application. In response to the invocation of the first URI by the first application, the second application checks that the destination specified by the return URI corresponds to a trusted partner in a set of trusted partners, and on condition that the return URI does indeed correspond to one of the trusted partners in the set, it invokes the return URI in order to return the data to the first application. The return URI uses a secure protocol which authenticates an identity of the destination specified by the return URI, and which returns the data over an encrypted channel.