It opens as a “capture” tab at the bottom of the vegas program, next to all of the other tabs there: capture, explorer, trimmer, project media, etc.
From there, I go to prefs, the device tab within prefs, the device type (IEEE 1394/MPEG2-TS Device)and the Device, my HDR-HC1 camcorder.
I can then use Vegas to control the camcorder momentarily before Vegas hangs and freezes.