Just as the name suggested, Pentahull Station was made up of five different capital ships that had tightly integrated with each other to form one large space construct.
On the one hand, Pentahull Station technically functioned as a single whole. The hulls were designed in a way that allowed them to reduce the barriers between them as much as possible in order to present the illusion that it was one big happy place.
The Pentahull Coalition maintained a common set of rules that applied to the entire station, so most people did not have to worry about watching their behavior after crossing over to a different hull.
On the other hand, there were definitely a lot of distinctions between the different station sections.