I'm new to nop and I've download the nopCommerce 4.20 - Source code, compiled and deployed.  
I got the site running with the installer.  

My question is:  how to Separate the admin site from the commerce site like the demo. I have a need to run the admin site running on an internal server and the commerce site on the dmz.   I found old internet searches mentioning that there was a nop.admin project, but don't see it in the latest source code.  

Is this still possible to do ?