David and All, Concerning Security and Delegation : Many thanks to David GROEP for indicating that document GFD.78 'Grid Security Infrastructure Message Specification' provides very useful information. This document is available at http://www.ogf.org/documents/GFD.78.pdf I have also created a link to it inside http://forge.gridforum.org/sf/docman/do/listDocuments/projects.pgi-wg/docman... Best regards. ----------------------------------------------------- Etienne URBAH LAL, Univ Paris-Sud, IN2P3/CNRS Bat 200 91898 ORSAY France Tel: +33 1 64 46 84 87 Skype: etienne.urbah Mob: +33 6 22 30 53 27 mailto:urbah@lal.in2p3.fr -----------------------------------------------------