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X Resources
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 - Function: x-get-resource attribute class &optional component subclass
     The function `x-get-resource' retrieves a resource value from the X
     Windows defaults database.

     Resources are indexed by a combination of a "key" and a "class".
     This function searches using a key of the form
     `INSTANCE.ATTRIBUTE' (where INSTANCE is the name under which Emacs
     was invoked), and using `Emacs.CLASS' as the class.

     The optional arguments COMPONENT and SUBCLASS add to the key and
     the class, respectively.  You must specify both of them or neither.
     If you specify them, the key is `INSTANCE.COMPONENT.ATTRIBUTE',
     and the class is `Emacs.CLASS.SUBCLASS'.

 - Variable: x-resource-class
     This variable specifies the application name that `x-get-resource'
     should look up.  The default value is `"Emacs"'.  You can examine X
     resources for application names other than "Emacs" by binding this
     variable to some other string, around a call to `x-get-resource'.

   Note: X Resources.