Identifying the target display in z/OS UNIX

The DISPLAY environment variable is used by the X Window System to identify the host name of the target display.

The following code is the format of the DISPLAY environment variable:

   host_name:target_server.target_screen

Value: Description
host_name: Specifies the host name or IP address of the host machine on which the X Window System server is running.
target_server: Specifies the display number on the host machine. This is usually 0, unless the host machine is running multiple X servers.
target_screen: Specifies the screen to be used on the target server. This is optional and defaults to 0.

For more information about resolving a host name to an IP address, see z/OS XL C/C++ Programming Guide.