The core concepts in Kno are:
A Space is the context for which an end user presents the same identity.
Multiple sites, services and applications can be grouped together in a single Space. If you have multiple services, but a user switching between them represents the same entity, group those services in a single Space.
A Persona is the information about a user that is available to a particular Space.
Personas identify a user but only have meaning within the single Space. The same user accessing two different spaces will have a separate Persona for each.