I’m currently thinking about a “notification server” using the cloud and Service Bus seems to fit my requirements. This article describes “Queues, Topics and Subscriptions” concepts:
These “brokered” messaging capabilities can be thought of as asynchronous, or decoupled messaging features that support publish-subscribe, temporal decoupling, and load balancing scenarios using the Service Bus messaging fabric. Decoupled communication has many advantages; for example, clients and servers can connect as needed and perform their operations in an asynchronous fashion.
Yes, it’s what I need.. let’s start to develop a test project, in order to understand also the development time (I’m a dba, but please appreciate my efforts 🙂 )