How are people running multi-instance logins? (multiboxing) other than separate physical devices?

Just run the .exe multiple times?
Android emulators?
Virtual machines?

Sometimes I need to test plugins and need to have two logins on at the same time.

On Windows running the .exe multiple times causes issues with the wgaf, config, and error.log files...

Maybe by using VM?

I don't know if this works in Windows and Mac, but in Linux you can just copy your installation into another folder, and then you can run both installations at the same time. Each one will only try to access its own copies of the files. It's way less effort than using a VM.

I just run the exe multiple times and set my wgaf and config to read only.

I have tried running the game in an android emulator, it kinda worked, however I had to use the arrow keys to steer. Surprisingly the emulator running VO used less memory then the windows client did. I don't know why that is, I guess the mobile version at the time was VERY efficient.

Launching two clients in same place under linux. I moved the error.log to a subdirectory. A symlink is created in place of it. Before starting VO, it creates a new errors log with date in the subdirectory and adjust the symlink to that. This way i keep logs of both instances.