If you have used this site, then you are familiar with the boxes that pop up when you hover over certain items. If you are unsure, hover over this. This feature has been kept unique to AceCalcs because of the nature for which it was implemented on the site. Well, was unique.
AceCalcs ToolTips (ACTT) was created as a way for sites outside of AceCalcs to enjoy the benefits of having hovering tooltips at their disposal. It is easy to get working and easy to use.
If you run a site or forum what would like to implement this feature, check out the install section.