As you all know Yahoo! Messenger has a feature called Invisiblity. It means that your buddies can hide from you by changing their status to Invisible, that way you think they are offline. Using Invisible.ir you can find out if your buddies are Online, Offline, or Invisible.
Invisible.ir allows you check multiple Yahoo IDs at the same time. With Display Image Catcher you can steal other user's display pictures. Invisible.ir is web-based and free.
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