About
This mod identifies areas within a vessel that can be crewed by Kerbals and through which Kerbals can pass internally to reach other parts that can be crewed. It is provided to make the concept of connected living spaces easily available to other mod developers and so to provide a single consistent understanding of which parts connect to each other, bringing together both multiple features via plugins and multiple part packs via configurations.
CLS itself has a simple GUI to show the player which parts are connected to which. It also has an optional feature that conforms the stock crew transfer system to CLS's view of internal connectivity.
The original author of Connected Living Space was codepoet, and the mod was maintained for a while by Papa_Joe,.then by Micha, and now back to Papa_Joe
Further Information
More information about this mod can be found in the Forum Thread which also lists the various mods which support CLS.