using 2 trainners in one computer is not a very good idea to get full quality to each one during trainning period as both have to share and could not concentrate 100% of what teacher explained. So, I would like to suggest you to accept only one person to sit at one Computer even thought Company requested you to accept for 2 persons in one time. You should refuse clearly of their demands and please explain them that it is not efficent for trainner and could not complete successful trainning. But I hope you can give chance again to join your trainning more persons from same Company in available time. Anyhow thanks for all.