The constants defined in this class are used to get or set parameters Model.getParamInfo or Model.setParam. Please refer to the Parameters section to see a list of all parameters and their functions. You refer to a parameter using a GRB.Param prefix (e.g., GRB.Param.displayInterval). Note that these constants are simply strings, so wherever you might use this constant, you also have the option of using the string directly (e.g, 'displayInterval' rather than GRB.Param.displayInterval).