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two questions about development

Question asked by jonlee on Mar 16, 2011
Latest reply on Jun 27, 2016 by jbarrez
first is how can a process instance back to the previous node, i have read the user guide, but i did't discovery the demo.
second is a circumstance that joint signature, if a actor have complete it, how can make the process instance move to the next node not through the others.
I want to know some examples about the two questions, thanks very much