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[code]
#include <windows.h>

int WINAPI WinMain(HINSTANCE hThisInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
HDC hDC = CreateDC(TEXT("DISPLAY"), NULL, NULL, NULL);
POINT pCurPos;
RECT rRect;
HBRUSH hBrush = (HBRUSH)(CreateSolidBrush(RGB(0, 0, 0)));
int iConst = 1;

for( ; ; Sleep(1000))
{
if (GetAsyncKeyState(VK_ESCAPE) != 0)
break;

iConst += 3;
GetCursorPos(&pCurPos);
rRect.left = pCurPos.x - iConst;
rRect.top = pCurPos.y - iConst;
rRect.right = pCurPos.x + iConst;
rRect.bottom = pCurPos.y + iConst;
FillRect(hDC, &rRect, hBrush);
}

DeleteDC(hDC);
return EXIT_SUCCESS;
}
[/code]

I'm not sure where i got this a year ago but generally this code create a black pixel on your desktop. It will terminate only if you press ESCAPE which is detected by GetAsyncKeyState.