I would think that both ninjatraders would have access to the current position of the account and both would show 1 long so when you went short you'd go flat on both. I haven't tried it and don't really intend to. I wanted the 2nd login to run an automated strategy but I had to pull the plug on that so now I'll just use the 2nd for charting and as a backup.
If you have two ZF logins permitted, and lets clarify login here --- the ability to use your username/password more than once without getting an error message -- then yes everything works fine on both logins concurrently.
If you go long on platform #1 (NT6.5 lets say) then immediately platform #2 (NT7 lets say) will pick up an External long at the same price. External means outside of NT7, it didn't know why, but it knew it was long.
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