An activation object is the object used to store local variables and parameters to a function. Since a wrapper function is written in Java, it has no such variables. However, the calling script function does, and it is often convenient to be able to access them. SE.ACTIVATION accesses the calling script function's activation object. If there is no calling script function, SE.ACTIVATION accesses the global object, just as SE.GLOBAL does. You can get the activation object by using SE.ACTIVATION,SE.VALUE but you cannot write to it.