Type + send message: All online players will see the message

Ctrl + E: Execute whatever code is currently stored in the clipboard
Ctrl + Q: Show the value of the current variable written in the chat input field
Ctrl + 9: Show context menu; each option inputs a code snippet for using on players
Arrow Up/Down: Navigate the player list (online players are always at the top)
Ctrl + ???: Send clipboard code to highlighted player to be executed on their client
Ctrl + M: View any of the existing message boards (choose a number; visual themes are not reflected here, only text content)