The functionality would be: Instead of having many item tooltips open new windows everytime it would open a new tab for the item onto the existing tooltip you have open. If you still want it to open a whole new window you could hold alt or something and click the link to open a new tooltip.
Sounds like a feature request for the author of TooltipTabs
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh