In Windows 8 Developer preview users can launch an app from the Metro Style. But if you have lots of app installed then navigating and selecting would take time. Listed below are some of techniques by which you can quickly launch an app.
Drag and Drop Apps in Metro Style
Metro Style allows users to drag and drop the installed apps. Using this feature you can move your favorite app to the very first row in Metro style.
Pin App to Taskbar
Another way to quickly access an app is by placing the app in Windows 8 Taskbar. You can pin an app to the Taskbar by first selecting the app in Metro Style and picking Pin to Taskbar from the menu list.
Creating Desktop Shortcut
The third alternative is by creating windows desktop shortcut method. Navigate to the application installation folder and locate the executable. Right click on the executable and select Create shortcut from the menu list.