Browsing Chinese (Simplified) translation

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From the menu (right-click -> visibility), you can also decide to keep it above other windows, or on the Widget Layer (if you use Compiz), or make a "desklet bar" by placing them on a side of the screen and selecting "reserve space".
Desklets that don't need interaction (like the clock) can be set transparent to the mouse (means you can click on what is behind them), by clicking on the small bottom-right button.