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I can see something called parameters in create input task,Script task ...etc.
What is that parameter tab.
How and where those are used.
Parameters give you the ability to store data on users tasks. (Alert, Incident, Approval Request, etc)
This basically gives you the ability to pass variable data and store it on a user tasks, helpful for triggering off them, etc.
There should be some information on this in the manual as well.