This command will display a message to the surrounding area as if the NPC object
running it was a player talking - that is, above their head and in the chat
window. The display name of the NPC will get appended in front of the message to
complete the effect.

// This will make everyone in the area see the NPC greet the character
// who just invoked it.
npctalk "Hello "+strcharinfo(0)+" how are you";