Out of the box feature of SAP to move error messages to error queue in 7.31

Hi,

As per my understanding,SAP provided feature of moving any erroneous message in integration engine from processing queue to the error queue which will not hamper the processing of subsequent messages maintaining serialization.Now my question is :

1) How can we achieve this in SAP PI 7.31.Is it separate plug in or we have to do some extra coding or config to achieve this.

2) Is it only for SAP PI ?If in case message fail in SAP ECC side then how we are going to handle this situation ?

3) In case of ICO based scenario or where there is no integration engine involved,what should be option to handle this ?

  4) Once failed messages moved to error queue in PI,would we get any kind of email alert and how we can resolve this ?

   Are there any known drawback for using this feature ?

Thanks,

RJ