[OSM-talk] forum.openstreetmap.org

[Alex S.]

Robert (Jamie) Munro wrote:
> JOSM couldn't do 2 and 3, particularly if 3 involved special browser
> plugins, which it could. There may be a solution if JOSM was to open
> your web browser for you on the OpenID login screen, but I'm not sure
> how it could complete the transaction.

via session id or cookie, or, in the case of once-per-session sign-ins, 
then by ip (this would certainly break at the first mapping party after 
it was implemented though).