Question: 

1. What is the correct procedure when a boy comes to see a girl for marriage? 

a) Can they have a conversation? 

b) Should a mahram be present in the room, or is it sufficient if the door is left open and a sister etc of the boy is present, as this is not regarded as khalwa 

c) Should it only be where they "see" how the other person looks, and the process is over? Also, is there any basis to the fact where a girl is supposed to keep her purda on, and only on request can she open her face?