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## Sending a message
```mermaid
sequenceDiagram
participant Alice PC
participant Alice Connection 1
participant Alice Phone
participant Alice Connection 2
participant Alice
participant Room
participant Bob
participant Bob Connection 1
participant Bob PC
Alice PC->>Alice Connection 1: `PRIVMSG Room :Hello!`
Alice Connection 1->>+Alice: PlayerCommand::SendMessage
Alice->Alice: Check permissions
Alice->>+Room: /send Room Hello!
Alice-->>Alice Connection 1: fulfil promise
Alice->>-Alice Connection 2: Updates::NewMessage
Alice Connection 2->>Alice Phone: `:Alice PRIVMSG Room :Hello!`
Room->>+Bob: Updates::NewMessage
deactivate Room;
Bob->>+Bob Connection 1: Updates::NewMessage
deactivate Bob;
Bob Connection 1->>-Bob PC: `:Alice PRIVMSG Room :Hello!`
```
## Context
```mermaid
C4Context
System_Ext(AlicePC, "Alice PC", "Alice's PC")
BiRel(AlicePC, AliceConn1, "IRC")
System_Ext(AlicePh, "Alice Phone", "Alice's phone")
BiRel(AlicePh, AliceConn2, "XMPP")
Boundary(Node, "Node", "Single server process") {
System(AliceConn1, "Alice Connection 1", "Projection nto an IRC socket")
System(AliceConn2, "Alice Connection 2", "Projection onto an XMPP socket")
BiRel(AliceConn1, Alice, "Cmds & updates")
BiRel(AliceConn2, Alice, "Cmds & updates")
Boundary(Core, "Core", "Core chat entities") {
System(Alice, "Alice", "Player actor")
System(Room1, "#room")
BiRel(Alice, Room1, "")
System(Bob, "Bob", "Player actor")
BiRel(Bob, Room1, "")
System(Players, "Player Registry", "")
Rel(Players, Alice, "References")
Rel(Players, Bob, "References")
Rel(Players, Rooms, "")
System(Rooms, "Room Registry", "")
Rel(Rooms, Room1, "")
}
System(BobConn1, "Bob Connection 1", "Projection onto an IRC socket")
BiRel(BobConn1, Bob, "Cmds & updates")
}
System_Ext(BobPC, "Bob PC", "Bob's PC")
BiRel(BobPC, BobConn1, "IRC")
UpdateLayoutConfig($c4ShapeInRow="3", $c4BoundaryInRow="1")
```