Totally, where you depart from ART, that is where you will return in order to leave for your property. I remember that some of the buses had a number, some did not not. When waiting for your ART, so as to arrive at
Disneyland,just board what comes by. There are specific bus shelters that you wait at, for ART, being the same as for OCTA.
There is a number at the top of the bus waiting area. Tip: If you would like to go to Target, via ART, board the number 1 bus, at the Disneyland bus and shuttle area, then just reverse your trip, to come back to Disneyland, then go from there.
There are discount passes as well that are available via their website. And you can purchase them as well at different hotels, that participate in the ART service.
http://www.rideart.org/ Their website will also show which hotels participate in their program. If yours does not, just look to see which is the closest stop to you. I do not see any good reason as to why you could not just go to another hotel, to purchase these. They are also available Disneyland, near the bus/shuttle area.