Merging sites…

Afternoon all, obviously I have stopped by to see if anyone can lend a hand on an idea I want to implement into mine and my buddies site? OK so we currently own a .com and a .net – WordPress installed on both sites both with the same title IE milshake.com & milshake.net the only difference is obviously the .net & .com extensions.

So what I want to do is merge them both into one site only bouncing between the two url’s (if possible) however at the same time only having one sign up method for a user to use both of the sites simultaneously with his one set of credentials, if that makes sense? We both run the same theme the only difference is the posts which i’d like to keep his connected to his url and mine connected to mine but accessible by users without the bother having to switch sites and log in again. Is it possible to link them together and talk to each other?

Just to clarify they are separate sites on separate Databases however there with the same provider (Smart Hosting) they both have the same url apart from the extensions (.net & .com).

Sorry if I haven’t come across clearly enough, and I would appreciate any help or advise, its been a while since I have done anything relating to websites, html, css…. And even back then I was rubbish! Could you kindly people please advise me?

Thanks, Stu.