Parameter maps are basically lookup tables . Simple example would be getting the product information based on the environment variable there are some predefined macros that help you get the information about a parameter map
There are 2 types of session parameters
1) Environment (defined by cognos) and 2) Model (this we can create)
Runlocale and machine are two session parameters that need some more understanding parameter maps and session parameter are defined by using #$ (hash and dollar)
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