The System Preferences of MacBooks come with several accessibility features, including the ones for the keyboard. Users can add modifier keys for remaining actives so that they can easily use the keyboard shortcuts without having to press multiple keys at once. You can also do a lot more. Here’s how you can use keyboard accessibility feature on your MacBook.
Please read the originial post here: http://www-macfee.com/how-to-use-keyboard-accessibility-features-on-macbook/