What I've done (maybe temporary) is to use main to spawn a package called LeafBridge::Client within the main thread and use that to spawn the LeafBridge::Client::Controller apartment. On spawn of this controller, I pass in the handle to $self (LB::Client). LB::C::Controller spawns all of the other apartments by calling $client->spawnApartment($controllerClient). $client being the LB::Client handle that was passed in and $controllerClient being the T::A::Client handle. That spawnApartment is called in the context of the LB::C::Controller apartment thread, not in the main thread. Since LB::Client doesn't do anything except run a loop that calls $controller->tick every second, it doesn't really do anything else but provide access to the apartment creation functions and to create the first apartment (LB::C::Controller). LB::C::Controller tracks all apartment threads and allows any apartment to talk to any other apartment by calling $controller->thread('LeafBridge::Client::XMPP')->send(@args) (the thread method passes the T::A::Client handle of the LB::C::XMPP apartment to the caller; send() is a method within the LB::C::XMPP apartment itself (it could be any arbitrary method in the requested apartment thread)). It seems to work well for now. It feels hackish, but it's the best I could do with the knowledge I have right now.