"You have two options. First, you can hold down the Alt key and tap Tab to cycle between open apps, Windows-style. Second, you can click the Windows List icon in the toolbar--it resides just above the green power button.
"Want to install new software? Click Application Store in the toolbar, then click the eponymous icon in the window that appears. Here you can find GIMP, Picasa, Thunderbird, and countless other programs (almost all of them open-source, meaning free). To install anything, just click the corresponding green Install button."
