GNU Emacs Manual - Resources X Go to the first , previous , next , last section, table of contents . X Resources Programs running under the X Window System organize their user options under a hierarchy of classes and resources.
Programs define named resources with particular meanings.
They also define how to group resources into named classes. Case distinctions are significant in these names. The order in which the lines appear in the file does not matter. Also, command-line options always override the X resources file. It actually represents the name of the executable file that you invoke to run Emacs.