Updating a process definition

Has anyone ever updated their process definitions while instances of the
old definition exist?  (Shark 1.1.2)
 
The createProcess() method does not seem to have a version parameter
that would let my code specify which version of the process definition I
want to instantiate.  I would assume that any new instantiation would be
the latest process defintion by default.
 
Unfortunately, I added a process variable to my new definition and,
while I can instantiate one just fine using the administrator
tool(because I can pick which version to use in the admin tool), when my
code runs, it throws a InvalidData error on the new process variable.
 
If I have to remove all the instantiated processes before I can update
the defintion, its going to mean the end of our project.
 
Greg
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