SENDER_RECEIVER
SENDER_INITIATOR|SENDER_RECEIVER,
SENDER_INITIATOR|SENDER_RECEIVER,
(sender & SENDER_RECEIVER) ? "target" : "initiator");
(sender & SENDER_RECEIVER) ? "initiator" : "target");
(sender & SENDER_RECEIVER) ? "target" : "initiator");
(sender & SENDER_RECEIVER) ? "initiator" : "target");