"MacOS X 10.2 and later block the ability of third-party programs to use the Command-Tab (Apple-Tab) keystroke as a hotkey. Instead that keystroke is reserved solely for switching applications from the Dock.
PullTab allows you to reclaim the Command-Tab and Command-Shift-Tab keystrokes from the MacOS X Dock. The reclaimed keystrokes can then be used in other applications, including third-party application switchers.
PullTab is an Application Enhancer module (APE) for Unsanity's APE system. You must have Unsanity APE installed to use PullTab."