The callback API is a proprietary API for writing client applications. As its name suggests, it assume you want to use the callback model of programming, where are you are typically waiting for events and responding to them. As such, your application will normally be waiting inside the scheduler for activity such as a timeout or an incoming message from a Polyhedra database server
The callback API is supplemented by the Socket API, which allows you to register various sockets with the Polyhedra client-side scheduler at the heart of the library implementing the callback API. If the scheduler recognises that one of 'your' sockets is ready, it will inform your application code via the callback function registered against that socket.
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