Join the Minecraft server
Do this once on each Windows PC. It takes about a minute.
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Download the setup file
Then open it from your Downloads folder.
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Windows will try to stop you. It shows
“Windows protected your PC”. Click More info, then
Run anyway. Then click Yes when it asks for permission.
A black window opens, prints a few lines, and waits for you to press a key.
If it says the home DNS server answered, it worked.
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In Minecraft, choose Multiplayer → Add Server,
and enter this as the address:
rivendell
You only need to do this once. After that the server is in your list forever.