Many people have accidentally deleted or removed the "Show Desktop" icon from their Windows taskbar, and then cannot find a way to get it back. Microsoft has published a Knowledge Base Article (Article ID 190355) explaining how to restore this icon on your taskbar.
To re-create the Show Desktop icon, follow these steps: Click Start > Run, type notepad, and then click OK. In Notepad, type the following text on the first line: [Shell] Command=2 IconFile=explorer.exe,3. Now hit enter and type the following on a second line:[Taskbar] Command=ToggleDesktop. Click File > Save As, and then save the file to your desktop with the filename Show Desktop.scf. Note: Notepad may automatically append a .txt extension to the file name. Remove this extension if present. The file name should be Show Desktop.scf without any other characters.
Show Desktop Icon on Windows source
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