I need to know how to change the parameter file based on the user that is logged on. If user 1 logs on then data paremeters should be from c:\temp\data\userdata1.csv if user 2 logs on then c:\temp\data\userdata2.csv?
How do I read the paremetres from the file and set the right file?
Use one file for all users. Read up on both the Virtual User's Guide and the hover help available with the parameter gadgetry. The intent of this gadgetry is to permit one source file for many users, from which to fetch like parameters.