Workflow Process Attributes can be identified as Process Input or Output Parameters using the Process Parameters 
dialog.
Input parameters can be populated when:
- Calling
openJob() – passing in name-value pairs.
- A Sub-process is started – passing the values of mapped attributes from the parent process to the sub-process.
- An Escalator is triggered – passing the values of mapped attributes from a process to an escalation process.
The values of Output parameters are passed back up to the mapped attributes of the calling process when:
- A Sub-process completes.
- An Escalation process completes.