lots... if the taskInstance is blocking, the pi.signal one will not make the process advance. If it is non-blocking, the process advances but leaves the task open. The ti.end will end the task instance in a node and signal the process to advance IF the task was 'signalling' and there are no more non-blocking tasks. So both operate on a different level View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4177360#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...