滑鼠中鍵操作
多數滑鼠與某些觸控板具有中央按鍵。在具有滾輪的滑鼠上，通常是直接按下滾輪便會觸發中鍵。若您的滑鼠沒有中央按鍵，您可以同時按下滑鼠左鍵與右鍵來觸發中鍵。
在支援多點觸控的觸控板上，您可以同時輕觸三隻手指觸發中鍵。欲使用請先開啟觸控板設定的輕觸以點擊功能。
許多應用程式可以透過中鍵進行特殊操作。
In applications with scrollbars, left-clicking in the empty space of the bar moves the scroll position directly to that place. Middle-clicking moves up to a single page towards that location.
In the Activities overview, you can quickly open a new window for an application with middle-click. Simply middle-click on the application’s icon, either in the dash on the left, or in the applications overview. The applications overview is displayed using the grid button in the dash.
Most web browsers allow you to open links in tabs quickly with the middle mouse button. Just click any link with your middle mouse button, and it will open in a new tab.
In the file manager, middle-click serves two roles. If you middle-click a folder, it will open in a new tab. This mimics the behavior of popular web browsers. If you middle-click a file, it will open the file, just as if you had double-clicked.
Some specialized applications allow you to use the middle mouse button for other functions. Search your application’s help for middle-click or middle mouse button.