FIPP asynchronous method

Hi all,

in the BOR FIPP there is a method named PostAsynchron to start accounting in asynchronous mode. The standard task that use this method is TS00408164.

The end of this task appears when the event 'POSTED' is published. First question, how it works technically ? How the event is sent ?

Second question, until the event 'POSTED' is not published the workflow is running but in the case of error how to manage this ?

Thanks for help.