The fancytoolstips package al­lows in­clu­sion of tooltips which con­tain ar­bi­trary TeX ma­te­rial or a se­ries of TeX ma­te­ri­als from an ex­ter­nal PDF file. A tooltip is a popup window that appears if the mouse hovers or clicks particular areas. To see the tooltips, you have to open the files in Adobe Reader.

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