hi there, i tried the example in the NS documentation to create a new timer as follows : class mytimer : public TimerHandler { ..... public: virtual double expire(Event *e) protected: MyAgent *a_ ; }; and also define a double mytimer::expire(Event *e) { .... } i would like to know how to set the interval variable so that when the interval reaches 0, it activates the expire function. Thanks. rgds, mien