Hear me out on this. I'm not just talking about mouseover tooltips, or even "sticky" tooltips.
Picture you're looking at a chart with data points all over it. You can mouse over any point and get a great-looking tooltip. It has a pointer that points at its source point.
THEN, while that tooltip is displayed, you hit F3 and mouse away. The tooltip remains in place, and now displays an X in its upper-right corner. This is now the only way it can be closed.
You then mouse over ANOTHER and ANOTHER data point, hitting F3 each time. Soon you have many tooltip windows all over your chart, all frozen in place due to your use of the F3 button.
Does anyone know of anything like this? "Freezable" tooltips? Where multiple instances are possible?