It's an AutoHotkey's script designed to help who needs to login in multiple accounts or in all accounts.
You can download it here or just access Releases on top menu.
Add your accounts in file "accountList.txt".
In configs.txt update your tibia.exe relative path.
If you have slower connection, make sure to raise "delays" parameter at config.txt
Also make sure to have a correct enterGame.png button from your tibia client.