A quick launch button is a small button on a device that allows you to quickly access or open a specific feature, application, or function without having to go through menus or search for it. Full definition
The home screen is a simple applications menu, with quick launch buttons at the bottom for browser, market, e-mail, gallery, and music. (laptopmag.com)
The aforementioned quick launch button brings you into TV mode (which really just means launching the video app of your choice). (pcmag.com)
You also get a rather chunky remote included in the box, which has quick launch buttons for four of the video apps available through Roku, including Netflix. (pocket-lint.com)