Defining Of Universe Parameters

Hi,

I just have a query in defining the Parameters at universe Level,

1. Is it necessary to upload .prm file for definng new Parameters under parameter tab of Universe Parameters.

2. and I have seen few parameters defined in one of the universe I am working

I can see only two values against a condition wither Yes or No..

For Example,, one of the parameter is like this EVAL_WITHOUT_PARENTHESIS    NO

what exactly this means ..

Please help me in this ,,,,,,,,,,,,,,,..................

Thanks IN advance...................