Tag <applet> is not allowed in forum posts, glossaries, etc., but it is allowed in resources.
The reason for this may be, that <applet> is not a safe tag, if you do not close it, it renders the whole page useless - you can not even delete post and have to erase it directly from database.
So it means: DO NOT ENABLE <APPLET> in lib/weblib.php !!!
Sorry for misleading information before.
General help
Java applets
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