I have dual citizenship. However, when I entered Canada by using my New Zealand passport, which was not the passport I used when I immigrated to Canada 3 years ago, the passport was stamped with "PR” without any indication of the expiration date. Did that mean they actually knew I am a PR under another nationality? The immigration officer at the airport didn't ask me any question, and I didn't present my PR card. Does that also mean I can actually stay in Canada as long as I want, without considering the 6 month period under the VWP as I thought? Thanks.