Parameter file in mapping

How to create parameter file and how to use in a mapping and workflow? Explaon with eg

pavankumarpk
Profile Answers by pavankumarpk Questions by pavankumarpk
Dec 25th, 2007
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ARUL_P
Profile Answers by ARUL_P

Jul 28th, 2008

Hi,
When a session starts to run, it checks for the database connectivity in the session properties. Alternatively, this details are stored in a Parameter file(a text file) and is stored in a particular place and called by the session(where the path of the parameter file is specified to call) for database schema details, hardcoded values in the mapping. this reduces the time to change the connectivity details if happened to change in future.