The actions stored by the interpolator are called keys. A key is a stored procedure call and has an index associated with it. The interpolator automatically calculates between the key values.
Keys are stored in the interpolator by calling one of the supported interface methods that can be interpolated. The method and the parameter values passed to it make up the key. Methods Supported by the Interpolator supplies a list of supported methods.
Every key stored inside an interpolator has an index value. When the key is recorded, it is stamped with the current interpolator index value. The key's index value never changes once this value is set.