Throughout the built- in applications you can have menu buttons appear at the bottom of the screen, be pulled down from the top, slide in from one side, have the hub alert slide in from the other side, or have the hub alerts replaced by yet another menu.
As we already mentioned, the Nexus lacks hardware buttons, which have been replaced with three softkeys at the bottom of the screen -- back, home and recent apps.
The list of too-late devices at CES goes on: Samsung has launched four of its own e-reading gadgets, at least one of which features a panel of buttons that emerged sleekly from the bottom of the device.