The process image can show you where it is currently sitting. For example, the 
jbpm-console has a process image, and if you look at the image for a process 
instance, the node where it is sitting will be highlighted.
I build that same functionality into my own webapp, so I simply click an 
"image" button for a process instance, and the image shows me where it is 
sitting.

You could also iterate through all task instances for the specific process 
instance, and those which have an end date are completed, and those whose end 
date is null, means its not completed. So you can determine from that which 
node it is sitting at in the process.

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