show desktop

#include <windows.h>
#include <shlobj.h>
#include <exdisp.h>

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR pCmdLine, int iCmdShow)
{
	// Initialize the use of COM objects...
	CoInitialize(NULL);
 
	// Create a Shell object pointer...
	IShellDispatch* pShell = NULL;
	HRESULT hr = CoCreateInstance(CLSID_Shell, NULL, CLSCTX_SERVER, IID_IDispatch, (void**)&pShell);

	if (SUCCEEDED(hr))
	{
		// Call the MinimizeAll() shell function...
		pShell->MinimizeAll();

		// Release the COM object when we're finished...
		pShell->Release();
	}

	CoUninitialize();
	
	return 0;
}