This applies to all versions of Windows.

Click the GN4 related icons on the taskbar.

Note: only the applications that were pinned to the taskbar will be available to be launched from the taskbar.

How to pin an application to the taskbar?

For Windows 8, in here http://windows.microsoft.com/is-is/windows-8/use-the-taskbar look for the Pin an app to the taskbar.

For Windows 7, see here: http://windows.microsoft.com/is-is/windows7/pin-a-program-to-the-taskbar.

How to pin a Website  to the taskbar?

See http://msdn.microsoft.com/en-us/library/ie/gg618532(v=vs.85).aspx.