Communicating with the X Server
Emacs LISP also supports numerous functions for communicating with the X server. We won’t describe all of them here, but just name a handful of the most important ones to give the flavor of what’s available.
For getting information about your server’s capabilities that may be helpful in display layout, you have x-display-pixel-height, x-display-pixel-width, x-display-mm-height, x-display-mm-width, x-display-planes, x-display-backing-store, and x-display-color-cells, and x-display-color-p. You can also change the sequences of characters sent by keyboard keys with x-rebind-key.
In general, all these X environment functions have the name prefix x-. Therefore, you can see the whole list of them by giving x- as a prefix to the Emacs help system’s apropos function.
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