You just have to keep them busy. It's the only thing that works for me, but its hard because they can't play together (have to have the same crayon etc), so I have one at one end of the house and the other with me, then I swap.
But how do u manage to keep one at one end of the house while the other is with you, my girls wouldnt have a bar of that without MAJOR crying and "thats not fair" statements