Socketio specific client join room

I know that I can use

socket.join(room);

But its not what I want.

I want to choose specific client connected to server and make him join room.

So it would looks like that:

OpEhq_0m7wzkZenVAAAB.join(room)

where OpEhq_0m7wzkZenVAAAB is a single client.

Thank you

via happyhippo