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Step 1
Launch your Yahoo! Messenger program and sign in using your screen name and password if you are not currently signed on.
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Step 2
Double-click the contact/friend who is currently displayed as being offline. This will automatically open the chat window.
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Step 3
Click the "IMVironment" button on the chat window and select "See all IMVironments."
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Step 4
Select "Yahoo! Tools" or "Interactive Fun" and click on "Doodle." After about a minute, Doodle will display a blank page if that the person is online (but in invisible mode). It only alerts you of the contact's online presence, but you still will not be able to chat until the contact disables invisible mode.






