void ufoProcessSetUserData( ufoProcess process_instance, void *user_data);
ufoProcessSetUserData sets user data to be associated with this instance of the process.
User data may be set to null.
If user data is set and is required to be copied when copies are made of the process, then you should supply ufoProcessCopyUserData. If user data should be tidied when the process is put away, you should supply the ufoProcessDeleteUserData user function.
ufoProcessSetUserData may be called within any user function.
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