a special task, one special variable, one.... you name it.... The issue that you have to act on this special task in one way or another (when does concurrency end? what if this lock stays by accident, what do you return to the other token). Sound like your trying to invent a mechanism that maybe should be in the engine... I mean, maybe it has to be possible to set on each variable which token might update it/is working with it).... But you have to retrieve changed values in tasks then (or not use task scoped variables but only process scoped variables View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4163361#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...