Dual display setup with Debian 9 text interface

I have a NCR EPoS terminal that has a dvi interface for the main screen and a vga for the secondary screen. Is it possible to have one application running in full screen on the dvi display and one on the vga display and have the two apps tall to each other. I am trying not to use any desktop environment as I want to have all the ram for the OS and my software Is what I want to do acually possible with the text interface of Debian or can this only be done in the graphical desktop Also with Debian 9 where do I put a my command to start my till software. Normally I would use ./NPoS/NPoS to start the software