@Andrew F that's right, "coop" just means that the company is not owned by a single individual, or "majority shareholders" or anything like that. The company is owned by the people that work there. A coop company is also operated / governed by the people that work there. My coop, for instance, began its life as a fairly loose-knit freelancer's group that has now grown into a full software development / consultant agency. But we've been a worker-owned coop the entire time.
That said, you can usually make a few assumptions about a cooperative workplace. You can usually safely assume that coop members are open-minded, generally progressive, and can cooperate with others. In my experience, you can also usually assume a member of a worker-owned coop doesn't care much for bosses or corporate structure in general. Being a good communicator is almost a prerequisite for worker coop participation.
And as far as I'm concerned, being a member of a cooperative automatically puts one on a path of anti-capitalism. It really opens one's eyes to the flaws inherent in capitalism, and the potential opportunity for improvement with cooperativism.