1. A method comprising: determining contextual information that describes a state of a first device and an interaction with a first application on the first device; based on the state of the first device, providing a notification of an opportunity to extend the interaction with the first application using a head-mounted device; in response to a received selection of the opportunity, providing to the head-mounted device the determined contextual information such that the head-mounted device is capable to extend the interaction with the first application on the head-mounted device.