If you hold down the Windows key (between Ctrl and Alter) and press M, this will minimise all open programs and show the desktop, the same as the show desktop icon, which I assume is what you have lost.
You could put a DESKTOP button in the system tray by rightclicking the system tray. Left click toolbars then leftclick on DESKTOP. This will place a button in the system tray which will allow you bring up the desktop at the same time on any webpage you have open at the time.
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