Hey e,

Nimrod is absolutely correct . Excel has most everything we need already and we as humans simply need to find how it does our work for us.

A few years back I needed to filter a pivot table for a user programatically as he felt the Excel way was too complicated. I created this user interface instead of teaching him how to use the normal pivot table dropdown filters. It took days to figure out the code and the lists and the code. Now that he's learned how to use the standard method, he has a better understanding of how it works and more capabilities that I every wrote code for.

YOU NEED to use the standard method of simply clicking on the tabs at the bottom of the workbook to change tabs. Left and Right become obvious when you can see which tab you are on. Why do you want to create another method/standard for doing something easy in excel when it is already there and easy to learn or teach.