korbipe fu'ivla

x₁ is the interface (mutually shared boundary) between entities x₂ (plural) allowing interaction x₃ between them

In notes:

dartrotci: x₁ is a remote control for controlling x₂ in event/state/enterprise x₃
trotci: x₁ is a controller (controlling tool) for controlling x₂ in event/state/enterprise x₃