SCSF Calling services asynchronously

Are there any best practices for calling SCSF services asynchronously?

Particularly I'm interesting in:

• Executions of requests in background
• Cancellation support
• Reporting prog开发者_如何学编程ress

Currently I came up with two scenarios:

1. Listener Service which listens in background for real-time updates and displays received data in grid (displaying stock quotes in real-time);
2. Long-running request, which supports cancellation, progress reporting and returns data incrementally.