Dendrobium Orchids-How to care properly?

This guy who does the landscapin at my job brought 2 to the workplace. They were lookin ill so I did some research. I learned to wait til they dry out before waterin them again, and gentle mists are appreciated. So far, I've rejouvenated them, and new buds are about to bloom.

But how can I tell if it's dead or just dormant?

" With the change of the day-length and cooler night temperatures of the coming winter, The nobile Dendrobiums and their hybrids begin to make their transition preparing for their winter nap. Their leaves turn yellow and fall off, not needing them for the next few months. By the time winter arrives they will be in a complete dormant condition. From November to February keep the plants dry. A light spraying is permissible if the canes are very shriveled but should not be necessary. Provide lots of light and good air circulation. By spring the plants will look very neglected with shriveled pseudobulbs and no leaves and if you did not know better you would think they were dead and ready for the trash heap."
Source: http://www.orchidlady.com/pages/orchidGarden/denNobile.html

And here are some more websites for you:

http://www.orchids-plus-more.com/your_basic_orchid_course.html

http://www.lincolnorchidsociety.org/pdf/Newsletter/Newsletter%2010-25-06%20web.pdf

http://www.bbc.co.uk/dna/h2g2/A3482787

http://www.orchid-depot.com/care/dendrobium_care.htm

http://www.imagine123.com/orchidtips/care/dendrobium.html

http://www.beautifulorchids.com/orchids/orchid_care_tips/individual_care/dendrobium.html