In reply to marzuki.

Thank you Marzuki - there's a lot of R&D and technical boffin work that goes into making these technologies work and look so simple. I'm not going to take credit for that - the Cisco 'Brain Trust' in engineering & R&D does an awesome job! I agree that the technology makes things much easier than they were before in all walks of life, especially in the industrial sector were safety is a key concern.