How to present NSWindow without title bar while keeping the system buttons

Question

How can one remove the title bar from a NSWindow while keeping the system buttons such as close, minimize and maximize?

How to make the Window slightly transparent?

This is the look & feel that I'd like to achieve:

Answer 1

I figured out how to achieve the desired design:

• In the storyboard, set NSWindow's Full Size Content View property to true
• Via code, set NSWindow's titlebarAppearsTransparent property to true