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Environment variables which can be used.

  DISPLAY       The X Server display to be used.
                Should be set on login

  XAUTHORITY    Location of the Xauthority file for Xauthority
                Defaults to  ~/.Xauthority

  XKEYSYMDB     "XKeysymDB" Location  ---  see hints.Motif for more info
                Defaults to  ${XROOT}/lib/X11/XKeySymDB

  XFILESEARCHPATH       System Application Resources files search path
  XUSERFILESEARCHPATH   User Application Resources files serach path
  XAPPLRESDIR           Alternative User Application Resources Directory
  XENVIRONMENT          Person Application Defaults file tobe loaded
                          immedialy after trying the "~/.Xdefaults" file
                For more info on these see  hints.Resources

  XCMSDB        path to client-side colorname mappings file!
                  See hints.Colors for more information

  LANG          Set the language %L part of resource search paths

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