Start using it:

If your main portal is dat://7f2ee...0c5/ and your work computer has a portal at dat://3ba71...829/

Visit your main portal at dat://7f2ee...0c5/ and run mirror dat://3ba71...829/
Visit your work portal at dat://3ba71...829/ and run mirror dat://7f2ee...0c5/
You're done! You can now Rotonde from any of the machines with ease.