2 short questions .. please consider: a) reactor.callLater(0, fun1) reactor.callLater(0, fun2) Is that allowed .. delay == 0? It seems to work .. but I want to be sure. b) reactor.callLater(T, fun1) reactor.callLater(T, fun2) Is the call _order_ first fun1, then fun2 _guaranteed_? For every T, and in particular T == 0?