What does (fakeclip-y) mean?

I installed the fakeclip plugin. Normally, plugins are fairly
straightforward (e.g., hit the "special" key (\) or something like
that). However, the fake clip plugin says that it automatically loads
default mappings like

"+y for <Plug>(fakeclip-y)

I've tried "+y in a variety of different ways: at the ":" prompt,
while in command mode, etc. and it doesn't do anything.

I'm sure I'm just missing something.

I searched for a definition of <Plug> on the mailing list, but may not
have been looking for the right thing.

Thank you in advance for any assistance.

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