Information Sources and Sinks in a Grid Environment Giovanni Aloisio 1 , Zolt´ an Balaton 2 , Peter Boon 3 , Massimo Cafaro 1 , Italo Epicoco 1 , P´ eter Kacsuk 2 , Thilo Kielmann 3 , Daniele Lezzi 1 1 Center for Advanced Computational Technologies ISUFI, University of Lecce and National Nanotechnology Lab/INFM&CNR, Lecce, Italy {giovanni.aloisio, massimo.cafaro, italo.epicoco}@unile.it 2 MTA SZTAKI Computer and Automation Research Institute Hungarian Academy of Sciences, Hungary {balaton, kacsuk}@sztaki.hu 3 Vrije Universiteit Amsterdam, The Netherlands {pboon, kielmann}@cs.vu.nl CoreGRID Technical Report Number TR-0022 March 15, 2006 Institute on Systems, Tools and Environments (STE) CoreGRID - Network of Excellence URL: http://www.coregrid.net CoreGRID is a Network of Excellence funded by the European Commission under the Sixth Framework Programme Project no. FP6-004265