TSB is a small TotalSpaces Add-On Application to extend TotalSpaces HotCorner Feature, so since the last TotalSpaces Update also brought the Pre-Lion All Windows Expose without Mission Control, but this was added as a Keyboard Shortcut that can be chosen by the User. TotalSpaces itself has Support for Full Screen Applications in its Overview Grid, but regarding to the number of Spaces you have chosen, this might be a little bit messy in the Grid, thats where TSB comes into the game: TSB replaces or adds another Hot Corner to your Screen triggering it own Overview, it offers you the Ability to choose what to do: Trigger Expose Enter TotalSpaces Overview Grid choose from up to 3 FullScreen Apps that are currently running in this Mode Thats like a Shortcut for all the possible Methods in one Hot Corner, but there is more: The Hot Corner is Modifier Keys enabled: You can change this behavior in the Settings, but e.g. you leave it as default: triggering the Hot Corner with your Cursor opens the TSB Panel triggering the Hot Corner with SHIFT Key pressed, triggers the TotalSpaces Grid View directly triggering the Hot Corner with the CMD Key pressed enters all Window Expose directly So you can either use all the TotalSpaces Features just with the Mouse and in a shorter way, or you can trigger all the Actions even faster without searching for Key Combos on your Keyboard and be more faster than as default TSB also allows you to force Safari WebBrowser to be fullScreen always, so each time you open a new Window TSB ensures Safari will be a Fullscreen Application TSB us a background Application sitting in your Menu Bar doing nothing and waiting for the Users Interaction with a Hot Corner defined in the App Settings