037_msc.cpp Sender Receiver A bit more complex msc diagram, with also parallel events. Sender_1,Receiver_1,Sender1_1, Sender,Receiver,Sender1, Sender_2,Receiver_2,Sender1_2; Sender_1->Receiver_1 [label="Command()", URL="nref Receiver::Command()"], Sender1_1<-Receiver_1 [label="Ack()", URL="nref Ack()", ID="1"]; Sender->Receiver [label="Command()", URL="nref Receiver::Command()"]; Sender1<-Receiver [label="Ack()", URL="nref Ack()", ID="1"]; Sender_2->Receiver_2 [label="Command()", URL="nref Receiver::Command()"], Sender1_2<-Receiver_2 [label="Ack()", URL="nref Ack()", ID="1"];