aqua/aqua-src/nopingback.aqua

service HelloWorld("hello-srv"):
  hello: string -> string

func sayHello() -> string:
    -- execute computation on a Peer in the network
    on "hello-peer":
        comp <- HelloWorld.hello(%init_peer_id%)

    -- send the result to target browser in the background
    co on "target-peer" via "target-relay":
        res <- HelloWorld.hello(%init_peer_id%)

    -- send the result to the initiator
    <- comp