Portrait Review Mode

I am a portrait photographer and when shooting high-volume, I need the ability for my assistant, on another laptop or iPad to review the images with the clients while I keep shooting. MOST IMPORTANTLY, It helps a lot if my assistant can bring up two or more images, side by side for the client to see. It is VERY hard to pick images while just scrolling form image to image. By bringing up multiple images it streamlines the process of the client to pick that ONE image they love to have retouched.