- See the main window of Yahoo! Messenger. An "offline" or "invisible" user will show a gray icon on the left of her name. In this example, we want to see if the user darling is online or not. Double-click on the username.
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- A message window will open. Send an arbitrary message to the user, or just send a BUZZ!!!. After sending, quickly proceed to step 3.
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- Click IMVironment button, select See all IMVironments, select Yahoo! Tools or Interactive Fun, and click on Doodle.
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- The last step and the most important step. After loading the Doodle IMVironment, there will be two possibilities.
- If the user is offline, the Doodle area will show "waiting for your friend to load Doodle" continuously, like this:
- But if the user is online (in invisible mode), after few seconds (it can take up to one minute, depending on connection speed), you will get a blank page. So the user is online!!!!
Note that some methods only work in some versions of Yahoo! Messenger. Please Download Yahoo! Messenger 
in order to do the tricks.
