Asynchronous events and method calls have the same quality of service expectations as the container's EJB timer service. If you're not familiar with the Timer service, don't worry, you don't need to interact with it directly if you want to use asynchronous methods in Seam.

To use asynchronous methods and events, you need to add the following line to components.xml:

<core:dispatcher/>

Note that this functionality is not available in environments which do not support EJB 3.0.