Answering Amen to a Live Stream

This live stream is for those physically unable to attend services (ill or infirmed ח"ו).
According to a responsa by Rabbi Max Sutton שליטה, "When hearing a live broadcast, a person answering Amen performs his duty of answering immediately after he hears the completion of the blessing..." However, "...the patient cannot satisfy his obligation of hearing the Megillah on Purim, hearing havdallah... and the like.
He is not... considered [part of the] minyan. 
For the full תשובה, click here.