@juriaanI was just testing and playing around on the patch you sent me. I copied and pasted the actor in the patch.@jhoepffner They had DHCP on so had the same subnet and ip class on the same network. I will be testing it again later today to see if it was something stupid on my side.ThanksAndy

Thanks a lot for the quick response. I guess, I better keep coordinates and "offset" separated... ;o) Best regards, T.

@dillthekraut That looks brilliant.All these suggestions look great. It took a while for responses to come so I didn't realise anyone had responded but I've just finished touring my last project and started on the one with the interactive walls. I've got a lot of tech and experimentation to begin but this is a fantastic starting point. I got a kinnect for £8 and a webcam and am away from home for 2 months so I'll have a play with those then try out the Pi/Arduino/touchboard suggestions in the new year. I'll share my progress.

@skulpture Thanks very much!