If you'd like to be able to launch your Google apps (Gmail, Hangouts, Google+, YouTube…) directly from your desktop, you can do this thanks to the Chrome App Launcher extension.
Open Google Chrome and sign in with your Google account. Click launcher to open the download page and then click on Get the Launcher to download and install the app:
If you are running Windows 10, you'll notice that the launcher is only available through Start menu. To move it to the taskbar, simply click on Start > Recently Added and then drag the Chrome App Launcher icon to your taskbar.
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