Registration in 2007 International Conference on Computational Science is compulsory for at least one of the authors of the accepted papers. The early registration will open in February 2007. You should check at:
http://www.iccs-meeting.org/iccs2007/index.html
Note that the registration for the workshop is actually the
registration for the whole ICCS'2007 conference. Therefore, you will
have free access to all the workshops and activities related to this
general conference.
Finally, note that the workshop chairs are only responsible
for all the academic aspects of the papers (including the submission,
reviewing and final selection, among others). For questions about
registration, lodging, visa, flights, or any other question, please
contact ICCS'2007 organizers.