How does direcTV ondemand and cinema work?

[matthew94065]

I'm new to direcTV and I have some questions

first, is ondemand available if you don't use the cinema connection kit? how long is a typical download?
second, once the kit is connected, does the download go through the internet or the satellite. I'm pretty sure its internet but I'm not sure how the set top box understands to switch between satellite and internet for downloads

Thanks!