This program allows you to browse a selection of the contents of your computer's hard drive with your TI-89. You can also rename, copy, move, and delete the files on your calculator and have the same changes made to the actual files on your computer.
There was both a program written for the calc in TI-BASIC and a program for the computer written in VB6. The calculator portion of it was written instead of paying attention in a history class that I took summer of 2001. I released it to ticalc.org when it was done. Because it was written in BASIC and running on a 12Mhz calculator it was too slow to be very practical, so it was more of an amusing proof of concept.
This is the program on the Windows side which created file lists for the calc app and then enacted changes made on from the calc.