Under the icon of the running application is displayed by an indicator (with configurable color for dark and light panels) and allows you to move the icons via right-click - left/right.
Here is the applet open Windows by default:
Dock Applet after installation and activation:
Installation into Linux Mint 17/17.1:
sudo add-apt-repository ppa:webupd8team/mate sudo apt-get update sudo apt-get install mate-dock-applet
After the installation is complete Dock Applet, right click on panel - add to panel and in the opened window, select Dock then Add.