Thank you DaveR. The teacher uses an ActivBoard 378pro, with an digital projector (connected from PC via HDMI cable) to project onto it. She doesn't want to lose student's ability to be interactive with the board and uses ActivInspire with her flipchart files. Would you recommend then Promethean Classflow as a suitable substitute for ActivInspire so we can use the new Chromebook rather than her aging desktop?