Provided herein are an answering terminal, an answer counting system and a question-and-answer session method, which do not force answerers to perform complicated operations of an answering terminal when one questioner and a multiplicity of answerers have a question-and-answer session. A control method is also provided. The forwarding implementation forwards its invocation to the implementation of that the virtual function in the implementing class. The activity indicators may comprise a variety of information useful in identifying one or more separate resource activities. Optionally, RF signals can additionally be couple to the common optical axis and transmitted and received by the telescope. Preferred processes maximize the amount of vinylidene olefin useful for detergent manufacture, and minimize deep internal olefin production.