Introduction

Although window systems tend to be quite different from one another in their core API, they expose a common set of functionality. For example, setting the window title or size, and detecting input events (keyboard/mouse events) is something that can be done from any windowing API.

Windowing systems

Some major windowing systems are described here:

• X Window System: windowing system for Unix-like operating systems. The API is exposed through the X11 protocol, with the X11 and XCB libraries. The XCB.jl library is available and registered, serving as both a low-level interface to XCB and a high-level package using abstractions defined in this package.
• Wayland: is aimed as a replacement to the old X window system, with better support for modern hardware features such as heterogeneous monitor refresh rates, high DPI monitors and HDR screens. Wayland.jl exists as a work in progress, which currently only implements a low-level interface to Wayland as a Wayland client.
• Desktop Window Manager: windowing system for Windows.

Many more exist, as can be seen on the Wikipedia page.