Most of the following rather for the interested than as a fast help.

• How to use eight-bit characters in X11, especially the characters that are not literally on your keyboard.

• Some hints about xmodmap(1) and the X11 keyboard model.

  If you want to map western european 8bit characters, you need their KeySym-names:

  • ISO-latin-1 KeySyms (from the system header, on this page even with their printables),
  • and Multi_key/Compose sequences,
  Both files are raw iso-latin-1 text instead of HTML.

  You might as well be interested in Jörg Knappen's postscript file "charset Latin-1 and the character names under LaTeX, HTML, X11 (xmodmap) and PostScript"

  If you want to use such characters in your applications, you might have to take care of your locale settings, as Unix originally is rather 7bit (ASCII) by default.

• About xterm(1)
  
  • The libXt with its feature 'translation tables': mapping actions on events.
  • XTerm X resources with comments and hints about numerous aspects of X resources in general.
  • xterm control sequences (ctlseqs.ms / ctlseqs.txt)

• Follow X11 requests with xmond/xmonui, e.g., "what font does it want?"

• Let xev(1) show also the current modifiers (plus option to limit output to key and button events only).

• German-lang only: Marcus Jodorf made a fine and almost complete summary (external link) about all the ways, Xresources get loaded.

• memory footprints of several (mostly small) windowmanagers on Solaris 2.5. Not really useful, but still interesting.