In Thailand students are habitually silent and do not ask questions, because they do not want to let the teacher look like they haven't done their job in teaching the 'right' things the 'right' way, save face. I'm thinking of using technology that helps overcome this situation.
Some universities have introduced ARS to help students contact the lecturer during presentation via smartphone/tablet. Students can vote for performance (too fast, too slow) and ask specific questions, which might otherwise disturb the flow of presentation for fellow students.
What are your feelings, experiences, and ideas about this? Do you use this kind of gadget, or would you use it if it were available at your institution? As a teacher or as a student?