Hello. I am making a sequence diagram with -say- 3 participants: outside, thread1, thread2.
thread1 and thread2 are entities that belong together in a box called process. And outside can send messages to either thread1 or thread2, but it can also send a message to the process in general.
But, for illustrative purposes, I'd like to outside to send messages to the process containing inside1 and inside2:
@startuml
box process
participant thread1
participant thread2
end box
outside -> thread1 : Send task.
ouside ->process : shutdown
@enduml
Is this possible? And if so, how would I do it? Thanks.