I have 2 domains for my single wordpress installation.
I know Multisite and already used it but I don’t want to use for this project.
The problem I got is that when I go to my second domain, I am not anymore logged. I’ve checked on the internet and saw that this may cause a security problem.
So, the major problem is for the comments. I can’t log with my credential to post a COMMENT in the second domain.
Read more here: Multiple domains / One WordPress / One login