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13.3 Interaction state management

For a given object, its interaction state (i.e. the watched events and the associated messages) can be saved and restored.
$\begin{rail} stateMsg : 'push' \vert 'pop' \end{rail}$

Interaction states are managed using a stack where the states are pushed to or popped from.

push: push the current interaction state on top of the stack.
pop: replace the current interaction state with the one popped from the top of the stack.

NOTE
The effect of a pop message addressed to an object with an empty stack is to clear the object current interaction state.

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