The study focuses on making large touchscreen displays easier to use by adding visual guides called TouchGhosts. These guides show users how to do different finger movements on the screen beyond just basic tapping and swiping. By having these helpful visuals appear when users touch the screen, it becomes easier for people who are not familiar with how to use such interfaces to navigate them effectively. The researchers found that by including these TouchGhosts, users could better understand and use the multi-touch features available, improving their overall experience with the technology.