I'm looking to quickly switch between to windows of an application in Unity. I looked at [Unable to switch between different windows of the same application](https://askubuntu.com/questions/147891/unable-to-switch-between-different-windows-of-the-same-application) but I didn't get any answer.

The only option I've got is to long-click on the icon on the dash and click on the window when they're all shown. That's definitely too long ! I'm sure there is a shortcut, like an `Alt`+`Tab` but I don't find it.

So, how can I quickly switch between windows of an application ?