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http*//perso.wanadoo.fr/philippe.jounin/man/tcp4u.htm
Tcp4u was written by Philippe Jounin and Laurent Le Bras and is Copyrighted 1996-1998 by them.
This library is free software; you can redistribute it and/or modify it under the terms the GNU Library General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version.
This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details.
You should have received a copy of the GNU Library General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
So if you see it in a UA string it probably means the same as if it was "Indy Library" or "Microsoft URL Control"...they're all windows libraries.