I am wondering if 2 applications can appear on the screen at the same time either side by side or whatever?
The reason for me to ask such question is that, let's say, when i scroll down the screen of my ADOBE READER application, 
the COREL PAINTER X application will disappear even though these 2 applications are being open concurrently (Picture 1 to Picture 2). 

That's indeed a very inconvenient and annoying experience when i am making some reference from both applications back and forth.   

 

It makes me also wonder if i can scale down COREL PAINTER X (or other app. like PHOTOSHOP, ILLUSTRATOR) screen so that they can appear on the screen side by side  so that even though i am working on one app. , the other one is still shown on the screen and just left inactivated ?