compiere callback functionality

  • Dear compiere forum members,

    to implement an ERP system into the infrastructure of a midsize company
    I would like to use compiere but the following functionality is needed:

    A message is sent to compiere containing a query or an order. This query is
    then accepted/rejected by a staff member. Now compiere has to send a message
    containing this status change to an external system or somehow trigger
    this system to send a status request to compiere.

    1) Is compiere able to send messages to external systems?
    2) Is there a trigger function at
       2.1) database layer?
       2.2) process layer?

    Thanks a lot in advance for your feedback or a reference to compiere's

    Kind regards