On a tablet screen there's actually room to make the bottom bar useful, so they added notifications and a small task bar to it. (gigaom.com)
Click this shortcut in task bar, and the full list of Metro Apps will open in Windows explorer. (thewindowsclub.com)
You can have a taskbar shown on only one display, a single taskbar stretched across all displays, and even an separate task bar for each display that only shows the apps open on that display. (howtogeek.com)