As part of my investigations into Indigo I was checking out how session management was implemented (see InstanceMode). However, as much as I really like tcpTrace as a tracing tool - trying to wade though the mire of SOAP headers was just too painful as tcpTrace doesn't have any awareness of SOAP. So asking around, Kev pointed me to Fiddler. Apparently Brock passed on this info to Kev (so kudos to Brock). The tool is awesome and a great addition to Indigo spelunking tools.