I have an idea. I don't think it will be as fast as you would like but it should work. Create a pdf or epub of the things you want on the e-ink side then use the attach feature to attach the items you want for the other side to your pdf/epub. You'll have to make sure the stuff for the tablet side will only open on the tablet (webpages, pictures, word docs, etc.). You'll have to click the link with the stylus and wait for the item to open. Again, it's probably going to be slower than you'd like and I'm not sure how all the links to the tablet side respond but webpage links are pretty quick so I can see a tangible workaround for now.