Originally Posted by
RatherBeInYOW
The secure OSS "corridor" (it also involves taking a bus back airside in to the D gate area) is at the top of the double escalator + stairs (on the left) before you go down to the main immigration hall.
I hate to sound naive, but does this work if you have checked bags by the way?
I have an upcoming FCO-YYZ-YVR flight and would be happy not have to hassle with YYZ security again.