Log Message:
-----------
Add an example about globally shared variables.
Modified Files:
--------------
htdocs:
index.html (r1.18 -> r1.19)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plscheme/htdocs/index.html.diff?r1=1.18&r2=1.19)
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