I guess I am still not completely certain what you are trying to accomplish, but, be that as it may, the recommendation by tech support is not a great solution at best and a catastrophe waiting to happen at worst.
If you are really trying to have each PC have the ability to access the other person's database, then the easiest way to do it, while not nearly as cheap, would be to install virtual machines on each computer and have two versions of AC running with each connected to a different database.
VMWare and Microsoft both have free versions, although I use the paid version of VMWare. What makes it a bit more expensive is you have to have licensed versions of Windows for each. But, once you had it running, you could keep it minimized and then just maximize it when you need to use the other database. You would want at least 2GB of RAM on each computer with a virtual machine as each would need its own RAM.
