Sirius XM Internet Radio - Can you listen to archived shows? Also, can multiple users listen to different things under one account?

I am thinking of purchasing Sirius XM Radio (but just for the internet streaming to phones, computers, and what-not else). I don't need a home or car receiver or anything like that, as I assume I can just use the free app to stream whatever I want. My goal here is to just get the app on my phone, then bluetooth the sound from my phone to my portable speaker or car speaker (either one, as they both connect with bluetooth as well).

But I was curious about (as my title states) if you can listen to archived shows when they aren't particularly live. For example, I would love to listen to the Howard Stern show, but as he does a morning show I wouldn't be up early enough to listen to it. So is it the type of thing where I could listen to the show anytime I want? Not just when it's live?

And lastly, if I allow my girlfriend to use my account, would we both be able to listen to whatever we want simultaneously? Or would we just simply have to listen at different times? (I'm thinking of a Netflix example in my mind.. I have an account, and we are both able to watch different things on different devices at the same time).