How dual box with premium?

Hello all,
I read on site we can open 2 client with premium account...but how? With log in in 2 different browser? Thanks!

 

Open browser log in with premium account first, launch game, Log out from browser, Log in with 2nd account, launch game

 

Ok ty, I try now!

 

or instal 2 internet browser log on first with premium account then log on second, the premium account must be lunched first.

 

most of time i use normal navigation & private one. Both from Chrome or Firefox

 

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