It's a little bit different. In Ada it's a real rendezvous. Either the "client" or the "server" task is running. In Erlang the mailbox is asynchronous, which me

It's a little bit different. In Ada it's a real rendezvous. Either the "client" or the "server" task is running. In Erlang the mailbox is asynchronous, which means the server can't make any assumptions about what state the client is in while it works on processing the message and sending it back and the client can't assume that the server is directly working on the message after it put it in his mailbox.