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If you are looking for a guide to creating aladarServer then it is here.
If enabled, automatically connects to the last known aladarServer upon page load.
If enabled, shows you on the minimap.
Click Connect to new server and enter a special link there that you should be given by the person who sets up aladarServer. After successfully connecting to the address, you will be able to connect automatically and connect to the last server.
Click on Connect to last server and the script will connect you to the last known server.
If the Auto-connect to last server setting is enabled, then the script will try to connect to the server, if the server is unavailable, nothing will happen.