As I understand it, they are like pharmacy techs. They stock the supplies needed for the anesthesia staff, change out canisters, and whatever else odds and ends are necessary. If i ever hear of places having any, its maybe 2 of them for the entire OR system. But I cant' help you on the education required.
We have them in the OR that I work in. They restock rooms and carts after cases and prepare lines and equipment for the CRNAs and MDs. It is on the job training at the hospital I work at, but i'm in PA.