maybe worth having a look at a Media PC remote control device, then you can rewrite/hack the driver on your linux box ?

The way I see it if you are trying to click a button on your screen to put it into "add mode" you are going to have to move the cursor.. With a media remote, you can hit a button and maybe bring up the screensaver.. Just a thought, how are you going to know when the advert is finished ???

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Thanks... Simon