Originally, linking the games required passwords for the most part, but you could also link using a Game Link cable to connect the games (provided you had two GameBoys to use).
Do the Virtual Console releases only work with passwords for items and rings and the like? The game still mentions using a Game Link cable, but I am assuming that is because this is a direct port of the original.
Am I stuck just remembering passwords and secrets and writing them down to enter later? Or is there any other way to link the two games?