Application Program Interface to read consistent data of the same virtual accelerator cycle from different devices or properties using event connections.
The two main classes are Subscription to subscribe to a set of devices and properties, and ApplicationCallback to receive the responses of the Subscription Service.
The subscription service is based on event connections. Other connections, e.g. periodical ones, are not (yet) supported.
Thanks to Ralf Huhmann for many discussions and helpful tips.