Abstract: Technologies are described herein for seamless transitions between applications and devices. A network-based or local context service provides functionality for storing and retrieving context data. The context service can expose a create activity method for creating a unique activity identifier (“ID”). The activity ID is associated with an activity, such as the execution of an application on a computing device. The interface exposed by the context service can also expose a method for storing context data, such as data that can be used to return an application to its pre-transition state. The interface exposed by the context service can also expose a method for obtaining context data. The context service can also expose a method for completing an activity. The context data can also be exposed to other services, such as business intelligence network services that analyze the context data to provide recommendations or other types of information to users.

Abstract: Technologies are described herein for seamless transitions between applications and devices. A network-based or local context service provides functionality for storing and retrieving context data. The context service can expose a create activity method for creating a unique activity identifier (“ID”). The activity ID is associated with an activity, such as the execution of an application on a computing device. The interface exposed by the context service can also expose a method for storing context data, such as data that can be used to return an application to its pre-transition state. The interface exposed by the context service can also expose a method for obtaining context data. The context service can also expose a method for completing an activity. The context data can also be exposed to other services, such as business intelligence network services that analyze the context data to provide recommendations or other types of information to users.