Windows 8, Microsoft's latest operating system, has its own app library. In many cases, these apps can replace now-aging bookmarks or favorites, and the software that we used to install from floppies, CDs or downloads. Windows 8 apps are often usable on both desktop or laptop PCs, as well as tablets. Navigation tricks include swiping up from the bottom, or right-clicking with a mouse to reveal app command tools. Apps can be downloaded from the Windows 8 Store, which is reachable only on machines running Windows 8.