<<< crystal star cluster
in file A, all strings 'crystal star cluster' in other files are automatically linked to A.
See: http://howm.sourceforge.jp/
and (although obseleted by Eon (and can't find code for Eon):
Linkd:
linkd-mode is a system for recognizing special s-expressions in all kinds of text files, and causing these "lisp hot spots" to become interactive when viewed within GNU Emacs. Several different activities are supported. The user may:
http://dto.freeshell.org/notebook/Linkd.html
also from the same author:
http://dto.freeshell.org/e/whiteboard.el
for sharing buffers
lifesnap:
http://dto.freeshell.org/notebook/:.html
(also http://en.wikipedia.org/wiki/ with ref to Peenemunde)