ServerPseudeCode

network send/recv/accept : c++

client->server : player-movement : c++ (distribution of player-sent message)

client->server : weapon/targetting/tooluse : handled by lua (client    msgA:sends start/stop    msgB:target(pos+quaternion+block+side))

client->server : drop item / put in container : lua (object is spawned in world and removed from inventory, object)  

server->client : object created/changed : c++ (object lists / manager)

server->client : chunk updates : c++

server->client : mobile updates : c++