To use Xdmx in its most basic form, start it with two or more -display arguments, a
display number for the Xdmx server itself and any other standard X server options:
blue$ Xdmx -display blue:0 -display red:0 -ac +xinerama :35
In this example, the Xdmx server is display :35, and it uses blue:0 (left) and red:0
(right) as screens in a Xinerama configuration with no access control. If blue:0 and
red:0 are both 800 ?— 600 in size, then the Xdmx server will have a display resolution
of 1600 ?— 600 pixels.
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234 Chapter 15: Building a Kiosk
In order to configure the spatial relationship of the constituent displays/screens,
Xdmx provides a configuration file option. A simple config file looks like this:
virtual testconfig 1600x600 {
display blue:0 800x600 @0x0;
display red:0 800x600 @800x0;
}
The file consists of one or more configurations, each of which consists of the keyword
virtual, a name assigned to this configuration, and a list of displays enclosed
in braces. Each display entry starts with the keyword display followed by the displayspec
(Section 1.12), display geometry, and the position of that display within the
Xdmx display space. Semicolons separate the display entries.
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