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If you ever have wanted to Minimize Windows into Application Icons than this is the article for you. Basically what I mean by that is when you click the yellow button, it usually minimizes to the shacks side but I`ll show you how to do it into the icon. All you want to do is follow the steps below:
1. Click on the logo (Apple Logo) and click system preferences.
2. Under the Personal heading click Dock
3. Check the first of the four check boxes at the bottom, "Minimize Windows into Application Icons"
4. Test it: Open an application and minimize it
THERE YOU GO! It should hopefully take effect, if not you didn`t follow the steps correctly above.
Image Source: I took it