CAPI is what allows for the control of a simulation or input widget inside the authoring tool. CAPI gives the ability to set up a simulation or input widget for student viewing and inspect how the student interacts with them.
CAPI stands for Control Application Programming Interface (API) and is the mechanism used by simulations and other widgets (multiple choice, input boxes, Annotate, etc.) to connect with the platform.
From the perspective of the authoring tool, CAPI can be considered:
When working with CAPI properties in the author, the value of a property has a specific type.