Show Look At

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To use Show Look At, enable Advanced menu > Character > Show Look At.

Thanks to Richard Linden for this info on what the different colors mean:

Attention	Color		Description
Nothing	dark gray
AutoListen	light gray		look at avatars and objects that are talking around you
FreeLook	blue		follow the mouse cursor
Respond	black		look at someone when typing a response to them
Hover	green		look at the object your mouse is hovering over, when hover tips enabled
Conversation	dark blue		look at someone after clicking on them
Select	pink		look at the selected (right-clicked) object
Focus	purple		look at the alt-zoom target
Mouselook	yellow		follow cursor in mouselook

There are various values that control how long these lookats are valid, how they prioritize relative to each other, what the percentage chance of them triggering is, etc. You can find the settings in character/attentions.xml (for example, C:\Program Files\SecondLife\character\attentions.xml).