[rules-users] Accumulator function

Hi All, I am building an accumulator function to get the maximum value with a limit, so for instance I have need to find the highest negative (closest to 0 without being positive). I am calling the accumulator maxnegative, I have created the function but can't seem to figure out how to get the engine to recognize it. The only documentation I have seen about it states you need to add a config line to the configuration file or use a system property. What configuration file is this referring to and/or what system property can I set to make this work. Thanks Glenn