trace invisible contacts in yahoo mesenger

trace invisible contacts in yahoo mesenger
first method: Voice Chat Method

1. Double Click on the user whose status you want to check.
2. Click on “Voice” icon on the toolbar, or select “Contact” menu and select “Enable Voice Chat” .
3. The deciding part… there are 2 possible results:
a) If the user is offline, you will get this message: “Internal server error. Cannot obtain voice token to start voice chat.”
b) If the user is invisible (actually online), you will see the Voice Toolbar.

second Method: Conference Invitation

1. Right Click on the user whose status you want to check.
2. When the menu appears, select Invite to Conference.
3. A window will appear. See at the right pane, the username you selected will be there. Now, click Invite.
4. The deciding part… there are 2 possible results:
a) If the user is offline, you will get this message: “None of the users in the invite list are available to join the conference. Please try at a later time.”
b) If the user is invisible, you will get a window similar saying: “You are now logged into voice conference