Helpfiles on how to communicate with others - players standing in the same room as you or players on the other side of the world.

adverbs - a list of adverbs and on how to use them
chat - on talking on different chatlines
converse - on saying multiple lines in a row
emote - on emoting messages
feelings - a complete list of all the feelings available
ignore_feelings - on ignoring feelings
ignore_tell - on ignoring the tells of a certain player
pemote - on pemoting messages
reply - on replying to the person that last told you something
say - on talking with the players in the same room as you
shout - on shouting a message to everybody
tell - on talking with players telepathically
whisper - on whispering secretly with a single player