Promethean boards and pen compatability / backwards compatability?
We've recently bought three new Activeboard 300s and (as expected) they have different pens from the existing boards.
What are my options with regard to:
a) a universal pen that just works on everything from Promethean?
b) a firmware upgrade for the older boards so they work with the newer pens as well?
c) Something else that makes it easy for a teacher to wander into a room and start scribbling without me needing to colour-code pens and boards?