Begins a new net message. If another net message is already started and hasn't been sent yet, it will be discarded.
The message name must be pooled with util.AddNetworkString beforehand!
Net messages will not reliably reach the client until the client's GM:InitPostEntity hook is called.
true, the message is not guaranteed to reach its destination
trueif the message has been started.
Adds a console command that sends a message to all clients.