* send: Reads the message from stdin and send it to the server.
* receive: Writes the message buffer from the server to stdout.
* interactive: Waits on stdin for lines with commands.
Available commands:
* I: Calls the editor (from VISUAL variable, if unset EDITOR is used. If both unset vi is used) and send the message if it is not empty.
* i: Send the next string from stdout
* L: Ask the server for current chat buffer's length.
* l: Print current chat buffer's length.
* w: Poll the server for new messages, print the chat buffer when they appear and execute the command specified by "DOBROHO_VECHORA_ON_WAIT" environment variable.