1. A method, comprising: registering an endpoint device in association with a host memory address in response to receipt of a request for a notification of a change in content state of the host memory address from the endpoint device; in response to a change in content state of the host memory address, sending a notification that the host memory address has changed content state to the endpoint device; and in response to receipt of the notification by the endpoint device, determining semantics associated with a change of content state of the host memory address by a data schema and performing an action by the endpoint device in accordance with the determined semantics.