I have a windows tablet with hdmi (lenovo thinkpad 8.3"). There is a lot of info on how to connect it up to a tv to display video but can it be used the other way round? I want to connect it to a dvd player and use the tablet as a screen (due to the dearth of decent portable dvd players). Is there a piece of software that can do that or does the hdmi only work in an outwards direction?