Multitasking

This is what I saw Marieann doing this afternoon during her free time after completing her homework. 

Playing Minecraft on one half of the screen and watching Sherlock Holmes Season 3 Episode 1 on the other  half! I was astonished by how well she could actually "multitask". She was building her mansion in Minecraft and was also following the storyline in Sherlock Holmes! How I know? Because I would throw her a question here and there about Sherlock Holmes lol. And she could tell me what's happening!
I wonder what happens if one half of the screen is online Science/English/Math/Chinese exercise and the other half is Minecraft. Will she be able to multitask as well?