Dobbiaco

Hi,
We are going for the first time to ski to Italy. We are staying in Dobbiaco where there is a small ski resort. Does anyone know if the ski pass you buy for one resort entitles you to enter some other resorts near-by (such as San Candido). Do you need to buy a ski pass for each resort or you have the option to buy a "combined" pass which allows you to go to several resorts?
Thanks a lot,
BB