We also have N4L (i'm not sure about chromecasts) everything works like normal, ipads connect to Tv via apple TV you can display internet on TV via laptop
Apple TVs will work with PCs through a piece of software called Air parrot (around $10 per license) to talk to the TV wirelessly, it is easy to install . You need to have a robust wireless network to avoid lagging of audio.ipads can be displayed on TVs through the apple tv using airplay.