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The slides introduce the concept of delegating user tasks in applications through messaging and app resolution of the application platform. The concept was implemented in the first version of the Android platform as is now becoming popular on other platforms as well. The W3C is discussing a draft for web intents, Mozilla proposed a document about web activities and windows provides contracts for certain user tasks.
The most popular task is "sharing". The user has a huge selection of available services from social medias, to email, from printing services to online storage. No application can ever implement all possibilities. Therefore, the application framework provides a selection of the user's preferred services. The different approaches are compared and code examples are given.