Form 5D students, who are studying Commerce this year, had a valuable opportunity to visit the Hong Kong General Post Office on 17 October, 2006.The Post Office staff gave our students a guided tour, to show the process of the mailing system and the most up-to-date post office services. The demonstration of the Culler Facer Canceller was amazing, and the students also learnt the built-in secret code of the stamps.