Binds with .!xxxxx in them.

[Adorable]

When you're online to any of CityDriving's servers, a JSON formatted file is generated, for example: http://api.tc-gaming.co.uk/json/garypants.json

Spoiler (Click to View)

{"timestamp":1503699663,"tcServername":"^7One","ucid":5,"plid":10,"username":"garypants","role":"civilian",
"hasSpeedtrap":false,
"x":-288.5795986877241,"y":224.02191195544367,"speed":12.0361328125,"location":"^3VIP Tribune^8","speedLimitMs":0.0,"speedLimitKph":0,
"speedLimitMph":0,
"isOnTrack":true,"hasCaution":false,"hasSiren":false,"hasHazard":false,"hasFollowMe":false,"hasRoadblock":false,"hasRamp":false,
"chasingPlid":0,"isJoining":false,"hasFailedToStop":false}

You can have a program download that page for you (from which you will obtain the location) then you will be using LFSs' InSim protocol (best way) to send your desired message when a command/hotkey/button is pressed.