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As far controlling devices? Yes, as long as your computer or tablet is compatible(it would have to be really ancient for it not work) and are using compatible app. I personally use videostream for movies on my PC because it comes with a mobile app, meaning I watch on my TV movies that are saved on my pc, using my phone(there are probably newer/better apps out now, but I've never felt the need to look). Chromecast can also mirror a device's screen so it would show a PowerPoint presentation on a TV if it is also on the computer screen that is being mirrored. You would still have to use your computer to change slides, though.
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