If the app lauching the window is placed as an icon in the task bar, you can pop its window app with Windows + (number of icon, counting from the start menu but

If the app lauching the window is placed as an icon in the task bar, you can pop its window app with Windows + (number of icon, counting from the start menu button). It doesn't work for some misbehaving apps which I guess didn't bother to do proper windows integration (Spyder IDE is one such example), but overall works great.