Net-Messenger

This cool little program allows you to send message boxes to a remote computer over a network or the internet. You can change the message type (i.e. exclamation, question, information), the buttons that will be displayed (i.e. OkOnly, YesNo, AbortRetryIgnore). And finally, the result of the button that the remote computer clicks will be sent back to you, allowing you to have your own chat with the use of message boxes.