Pilot Discussion With a Global Perspective
By Robert Shearman Jr 1155655
Josh Glottmann 1275389 wrote:".msg OAK_CTR (message)" without the quotes.

Just make certain it's .msg that you typed, because (at least in other clients; I assume it's the same with xSquawkBox) any unrecognized command (if you typo it or accidentally use .mes) will be interpreted as a message to be sent out over the channel. It's particularly embarrassing if you were PMing someone to laugh about someone else's goof-up. (Not that this has ever happened to me... ;-) )

Side note... in vPilot, I now use .chat {callsign} to open a chat tab first, then type the message in there, to prevent making the same gaff. I learn from my ... err ... other people's mistakes... lol.