---
name: "DMX"
section: "3"
platform: "linux"
package: "libdmx-dev"
version: "1:1.1.4-2"
release: "Debian 12 (Bookworm)"
platforms: ["linux"]
url: "https://new.carta.tech/DMX"
---

# DMX(3)

X Window System DMX (Distributed Multihead X) extension

## NAME

DMX - X Window System DMX (Distributed Multihead X) extension

## DESCRIPTION

The DMX extension provides support for communication with and control of [**Xdmx**(1)](/Xdmx/1.md) server.  Attributes of the [**Xdmx**(1)](/Xdmx/1.md) server and of the back-end screens attached to the server can be queried and modified via this protocol.

## SUMMARY OF LIBRARY FUNCTIONS

The following is a summary of DMX library functions:

[DMXQueryExtension(3)](/DMXQueryExtension/3.md) - determine if DMX is available

[DMXQueryVersion(3)](/DMXQueryVersion/3.md) - determine DMX extension version

[DMXSync(3)](/DMXSync/3.md) - flush protocol requests between [**Xdmx**(1)](/Xdmx/1.md) and back-end X servers

[DMXForceWindowCreation(3)](/DMXForceWindowCreation/3.md) - force immediate back-end window creation

[DMXGetScreenCount(3)](/DMXGetScreenCount/3.md) - determine number of back-end screens

[DMXGetScreenAttributes(3)](/DMXGetScreenAttributes/3.md) - determine back-end screen attributes

[DMXChangeScreensAttributes(3)](/DMXChangeScreensAttributes/3.md) - change back-end screen attributes

[DMXAddScreen(3)](/DMXAddScreen/3.md) - attach a new back-end screen

[DMXRemoveScreen(3)](/DMXRemoveScreen/3.md) - detach a back-end screen

[DMXGetWindowAttributes(3)](/DMXGetWindowAttributes/3.md) - determine back-end window attributes

[DMXGetDesktopAttributes(3)](/DMXGetDesktopAttributes/3.md) - determine global bounding box

[DMXChangeDesktopAttributes(3)](/DMXChangeDesktopAttributes/3.md) - change global bounding box

[DMXGetInputCount(3)](/DMXGetInputCount/3.md) - determine number of input devices

[DMXGetInputAttributes(3)](/DMXGetInputAttributes/3.md) - determine input device attributes

[DMXAddInput(3)](/DMXAddInput/3.md) - attach a new backend or console input

[DMXRemoveInput(3)](/DMXRemoveInput/3.md) - detach an input

DMXAddBackendInput(3) - attach a new back-end input

DMXAddConsoleInput(3) - attach a new console input

Each of these functions is described in its own man page.

## SEE ALSO

[**Xdmx**(1)](/Xdmx/1.md), [**xdmxconfig**(1)](/xdmxconfig/1.md), [**vdltodmx**(1)](/vdltodmx/1.md)