The Launcher application is a switchboard that presents the same shortcuts as those available from the Start menu. It serves as a starting point for work with QuickOPC. In addition, for users of Windows 8 and later, it allows them to easily navigate the various QuickOPC shortcuts, as the Start menu in Windows 8 and later is essentially broken for applications that install a hierarchical structure of shortcuts.
The Launcher is only available on Windows, when OPC Data Client has been installed with the Installation with the Setup Program.
The Launcher application is also accessible from a desktop shortcut, from the Programs group (Start menu), and from the Quick Launch bar (note that Quick Launch isn't visible by default; to enable it, see https://support.microsoft.com/en-us/kb/975784).
You can use the tree on the left side to select a group of actions you are interested in, and then view the actions in the list on the right side. You can launch any action by double-clicking on its icon, or by selecting it first and then pressing the "Go!" button.