...
The content of this variable is the name of the display to which X11 applications will connect (usually the name of the user workstation). If users have a server access control program for X, they must add the gateway hostname to their host list allowed to make connections to their X11 server, e.g., assuming that the Member State ECaccess gateway (see Ecaccess concepts section 2.2) runs on the server "ecaccess.meteo.ms", with the "xhost" command
...