The description of Y! Notifier - Play With New Friends
Y! Notifier is a small but useful utility that notifies you when a Y! Messenger friend becomes online (even he/she is invisible) / offline. Thus, Y! Notifier helps you detect invisible Yahoo! Messenger users, also.It is similar to Buddy Check but does not require login data. It is also FAST.It uses the www.detectinvisible.me service.
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