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) It should be noted that while the server itself didn't natively support moving windows across X Screens, could be aware of the availability of multiple displays, and they could allow (by their own means) the user to “send” a window to a different display (effectively destroying it, and recreating it with matching content, but taking into account the different characteristics of the other display).
Multiple X Screen support being dependent on the client, rather than the server, is actually a common leit motif in X11: due to one of its founding principles (“mechanism, not policy”), a lot of X11 features are limited only by how much the are aware of them and can make use of them.
The upside of this is that when the toolkit gains support for a certain feature, all applications using it can rely (sometimes automatically) on this.
The downside is that if the toolkit support for certain features or configurations, suddenly all applications using it stop supporting them too.
This extension (Xinerama) had some requirements (most importantly, all displays had to support the same visuals), but for the most part they could be heterogeneous.
An important downside of the Xinerama extension is that while it provides information about the resolution (in pixels) and relative position (in pixels!
If you only care about “how to do it”, jump straight to The RANDR way, otherwise read along.
The X Window System (frequently shortened to X11 or even just X), is a system to create and manage graphical user interfaces.
Proper support for such configuration requires all graphical and textual elements to take a number of pixel which depends on the monitor it is being drawn on. A single server could make use of multiple monitors (referred to as “X Screen”s), and each of them could have wildly different characteristics (for example: one could be a high-resolution monochrome display, the other could be a lower-resolution color display).
Point of interest for our discussion, the RANDR extension took into consideration both the resolution and physical size of the display even when originally proposed in 2001.
And even today that it has grown in scope and functionality, it provides all necessary information for each connected, enabled display.
Bitmapped visual surfaces (monitor displays, printed sheets of paper, images projected on a wall) have a certain resolution , i.e.
a certa number of dots or pixels per unit of length: dots per inch (DPI) or pixel per inch (PPI) is a common way to measure it.
For example, my current laptop has a built-in 15.6" display (physical dimensions in millimeters: 346×194) with a resolution of 3200×1800 pixels, and a pixel density of about 235 DPI —for all intents and purposes, this is a Hi DPI monitor, with slightly higher density than Apple's Retina display brand.