> GL : Graphical layer - GUI > DL: Definition Layer - scripting\XML layer > BL: Brokering Layer - brokering > PL: Processing Layer - dataflow handler Fine with me! (what about Visual Layer for the GUI, it's VSH after all...) Jean-Marc -- Jean-Marc Valin Universite de Sherbrooke - Genie Electrique valj01 at gel.usherb.ca