each country in the schengen agreement will have different applications according to their immigration practices. you would need to apply at the embassy of a country you want to visit, and they will advise and give you the visa that they feel you need. once you have that visa, it will allow you entry into any schengen country as long as that visa is valid. an ecuadorian friend, married to a spaniard here in the UK, was only able to get 45 day visas to spain, so you may not be able to get a long term multiple visit visa, depending on your nationality and the country you are applying to visit.