Red/yellow/green dots

Hi awwhite975,

I understand that you would like to resize the close , minimize , or maximize a window buttons across all the applications on your customer's Mac. I can give a few suggestions to help you out.

First, I would look to see if they are using a Retina Display Mac. If they are, then you should see something like the images below when you go to System Preferences > Displays.

As you can see, you will have the option to enlarge the text, as well as those buttons. Take a look at the first article below that speaks to using a Retina Display.

Using a Retina display
https://support.apple.com/en-us/HT202471

Now, if they are not using a Retina Mac, then you can simply just change the resolution to a different scaling. This will make everything not look as sharp, but will accomplish what you are looking for. This is located in the same place, System Preferences > Displays and you will see an option for Scaled. Then it would be a matter of choosing the resolution that suites your client.

OS X Yosemite: Adjust your display’s resolution
https://support.apple.com/kb/PH19043​

The last thing you can do is enable Zoom for your customer. This can either create a small window that will zoom around the cursor so they can click one of the buttons. Take a look at the next article to go over those types of Accessibility features on a Mac.

OS X Mavericks: Use accessibility features
https://support.apple.com/kb/PH14322

Have a great day!

Hey awwhite975,
It was no problem with the assist and glad that I could steer you in the right direction.
Take care!