How do IM someone throught command prompt?

To send an instant message (IM) through the Command Prompt, you can use the "msg" command on Windows. For example, typing msg username Hello, this is a message! will send a message to the specified user on the same network. Ensure that the Messenger service is enabled and that you have the necessary permissions to send messages to that user. Note that this feature may not be available on all Windows versions or in certain network configurations.