Updating services during real-time communication and sharing-experience sessions

Disclosed herein are representative embodiments of tools and techniques for updating services in sharing-experience sessions during communications calls. According to one exemplary technique, a first computing device initiates a communications call and receives capability information for a second computing device. The capability information for the second computing device includes information indicating attributes of a service supported by the second computing device. Additionally, the first computing device evaluates the capability information to determine that the service is supported by the first and second computing devices. The first computing device initiates a sharing-experience session that includes the service. An update message comprising update information for the service is received, and based on the received update information, content of the service is updated.