Contact with Secretariat
Telephone:
(+36 1) 332-9349, 332-9390,
Telefax:
(+36 1) 331-8140,
Snail-mail:
H-1372, P.O. Box 451,
Visiting address:
1054 Budapest, V. Báthori u. 16., Hungary.
On-Line information
http:
http://olympiads.win.tue.nl/ioi/ (the IOI Secretariat)
There is also a CEOI Mailing List. You may subscribe to Ceoi mailing list by filling out the form on the following webpage: http://www.inf.bme.hu/mailman/listinfo/ceoi