Intra-System

Intra-System:Intra-system (in·truh sis·tuhm) describes events, activities, conversations, etc. that occur within or between a system, such as in their innerworld.

Term Origins
Intra- is "a prefix meaning 'within,' used in the formation of compound words." A system is a collection of headmates in the same brain/body. Therefore, intra-system refers to things occurring within a collection of headmates.