Barry: I expect you know about the Xerox and Olivetti active badge experiments? Try the CSCW/CHI literature for that eg via the hcibib: http://www.hcibib.org/gs.cgi?terms=active+badge&highlight=checked The UK's VirtualSociety? programme had a project on this - see http://virtualsociety.sbs.ox.ac.uk/projects/mason.htm, http://www.sociology.plymouth.ac.uk/~virtsoc/ and search http://virtualsociety.sbs.ox.ac.uk/reports/publications.htm for 'Mason' Ben -- Dr Ben Anderson www.essex.ac.uk/chimera +44 17710 187 806