Register an Evaluator Command or Expression at Initialization
An unevalated command or expression for the interface is supplied, typically using
substitute. When an evaluator from the class is created, this
command will be evaluated. Repeated calls to this function, to
serverImport() will evaluate the corresponding requests, in the order in
which the corresponding calls took place (typically in the source of a pacakage).
an unevaluated command or expression for the evaluator.