Look here
http://www.nu.tu-darmstadt.de/TVremote
Ok, it is in German, but the University of Darmstadt has developed something like this 3 years ago (Wi-Fi, Java on PDA, even on a phone). Nice feature: The lesson was filmed and students could watch the recording later via Internet and thereby select "bookmarks" in the stream which they had marked during the lesson.
Could you please give some more details: Which conference and where?
20 year lifetime or 20 year battery lifetime? Any more details about the products?
Can you give some more details about the pic and the number of handhelds that were in range at the same time? Design of the base station?
Look here http://www.nu.tu-darmstadt.de/TVremote Ok, it is in German, but the University of Darmstadt has developed something like this 3 years ago (Wi-Fi, Java on PDA, even on a phone). Nice feature: The lesson was filmed and students could watch the recording later via Internet and thereby select "bookmarks" in the stream which they had marked during the lesson.
Do you remember any more details who was developing it? And how far they got?
"There are also Wifi capable "clickers" available" Can you give an example? Thanks!