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The encoding and interpretation of the display name is implementation dependent. Strings in the Host Portable Character Encoding are supported; support for other characters is implementation dependent. On POSIX-conformant systems, the display name or DISPLAY environment variable can be a string in the format:
hostname:number.screen_number
hostname Specifies the name of the host machine on which the display is physically attached. You follow the hostname with either a single colon (:) or a double colon (::).
number Specifies the number of the display server on that host machine. You may optionally follow this display number with a period (.). A single CPU can have more than one display. Multiple displays are usually numbered starting with zero.
screen_number Specifies the screen to be used on that server. Multiple screens can be controlled by a single X server. The screen_number sets an internal variable that can be accessed by using the DefaultScreen() macro or the XDefaultScreen() function if you are using languages other than C (see "Display Macros").
For example, the following would specify screen 1 of display 0 on the machine named ``dual-headed'':
dual-headed:0.1