It is pretty common to have multiple wireless microphones going during the same public speaking engagement. When speaking in Thailand last week I ran into a situation that has never happened to me or the other seasoned presenter before. RF stands for "Radio Frequency" which means that the wireless mouse doesn't have to be in line of sight with the receiver like an infra red mouse would. The AV crew that sets everything up usually makes sure that they are all on different frequencies so that no cross over occurs. You should still double check it anyway.

It is much easier now that wireless microphones are so readily available. You can calmly go into the audience with a wireless handheld microphone. Don't forget to bring the microphone back to your mouth for the answer.) Another technique I use frequently is to speak directly to one audience member. I love to interact with the audience. I