http://:1400/support/review - this is the best one, lists a menu link for each device plus the Network Matrix
http://:1400/status – gives a long menu of commands for that particular device
Topology - gives concise list of all Sonos devices
One thing I have not found out is what WiFi SSID a given speaker is on (i have three WiFI networks), if anyone knows where that can be found let me know!