? about IPod touch

My teenage daughters both have IPod touches and I love the feel of it. I have a Palm TX and I love the capabilities, but I hate how bulky it is.

Right now, I have Skyscape's constellation, tabers, and saunder's Q&A downloaded plus Epocrates free RX on the TX

Can someone explain to me how the IPod touch works with skyscape. Can you access the programs if you are not in an area with wifi. We live in a rural area without much wifi access. The last clinical site I was at did not have access.

I'd love to switch over but I want to be able to access the programs regardless of internet access.

TIA!