It looks like the oversized touchpad without any physical buttons is going to be a staple of Chromebooks. The Google Cr-48 laptop had one, as do the new Samsung Series 5 and Acer AC700 Chromebooks. While there are no left or right buttons, the touchpad is clickable. That means you can press down on the entire touchpad to register a left-click action. You can emulate a right-click by pressing with two fingers instead of one (or just pushing down with one finger while the other hovers on the touchpad).
But if you’re not a fan of pressing down on the touchpad, you can enable a tap-to-click option by digging around in the system settings. This allows you to simply tap on any link or icon on the screen, much the way you would with a typical Windows notebook touchpad.
You can find the “enable tap-to-click” option by pressing the toolbar icon and then choosing Settings and then System. Or you can simply enter chrome://settings/system into the location bar.
In order to right-click you’ll still need to place two fingers on the clickpad and press down. But for standard run-of-the mill clicks, this feature may save you a little bit of time. It may also lead to unexpected behavior such as inadvertent clicks if your palm brushes against the touchpad while you’re typing, which is probably why the option is disabled by default.
via Chrome Story