Explanation of the above example

USBMON is not a sniffer
It cannot look at the wire, only at higher levels
USB frames and timing require specific hardware
And USB is not a shared channel like Ethernet

"S" means "Submit" and "C" means "Complete
The software stack is a state machine
Every submit must be followed by a complete, possible delayed

"Co" is "control out", we also have "Bo", "Ii" etc
"000:00" is endpoint 0 of device 0 (not enumerated yet)
"036:00" is endpoint 0 of device 36 (after enumeration)

"64 <" at the end of a submit line is the input buffer size
The reply can be no bigger than that