Chat with friends and family on the internet using Google Chat. Windows XP includes the Windows Messenger program that you can use to send instant messages to other Messenger users on the Internet or. Instant messaging IM is a form of real-time direct text-based chatting communication in push mode between two or more people using personal computers or. Learn more about instant messaging at. Trillian, the free instant messenger for Windows, MacOS X, Android, iPhone, BlackBerry, and the Web. Exchange messages with friends, family, and colleagues online. Allows you to instant message with anyone on the Yahoo server.