All story state information is included in the StoryState class, including global variables, read counts, the pointer to the current point in the story, the call stack (for tunnels, functions, etc), and a few other smaller bits and pieces. You can save the current state using the json serialisation functions ToJson and LoadJson.
StoryState Class Documentation
Exemple #1
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        // Warning: Any Runtime.Object content referenced within the StoryState will
        // be re-referenced rather than cloned. This is generally okay though since
        // Runtime.Objects are treated as immutable after they've been set up.
        // (e.g. we don't edit a Runtime.Text after it's been created an added.)
        // I wonder if there's a sensible way to enforce that..??
        internal StoryState Copy()
        {
            var copy = new StoryState(story);

            copy.outputStream.AddRange(_outputStream);
            copy.currentChoices.AddRange(currentChoices);

            if (hasError) {
                copy.currentErrors = new List<string> ();
                copy.currentErrors.AddRange (currentErrors);
            }

            copy.callStack = new CallStack (callStack);

            copy._currentRightGlue = _currentRightGlue;

            copy.variablesState = new VariablesState (copy.callStack);
            copy.variablesState.CopyFrom (variablesState);

            copy.evaluationStack.AddRange (evaluationStack);

            if (divertedTargetObject != null)
                copy.divertedTargetObject = divertedTargetObject;

            copy.previousContentObject = previousContentObject;

            copy.visitCounts = new Dictionary<string, int> (visitCounts);
            copy.turnIndices = new Dictionary<string, int> (turnIndices);
            copy.currentTurnIndex = currentTurnIndex;
            copy.storySeed = storySeed;

            copy.didSafeExit = didSafeExit;

            return copy;
        }