Right - it's just like posting a message on the forum, except only you and the sender see it.
The lime question for paphs is pretty involved. Certain species grow in their natural habitat on limestone cliffs, so you need to look up cultural habitat distribution for each species, take into consideration which species are involved any hybrids you have, etc. etc.
There are several good locations for this information - a site called slipper info.com (no space) has great distribution maps, and Antec's site has a good article on growing calceolus paphs. I'm sure we have articles at SOF also. This is a nice forum here, but it's pretty general, and if you really want specific info on growing Paphs, that's a great place to find a ton of info.
I treat my lime loving species several times a year with oyster shell to increase the calcium, others fertilize occasionally with calcium-nitrate.
At any rate - this is probably way more info than you wanted -if you don't have any paph species, I wouldn't worry too much, just fertilize regularly and they should in general do fine. Something to get more into when you become a true paphead and grow and think about nothing else!
One more thing regarding your digression - in general you're going to do better ordering plants online from specific reputable orchid venders than from a local nursery - better prices, better (cared for) plants too.