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Can you please be more precise, what do you mean remove current mapping?

I'm very interested in this. My remote sends Control_L + key.

If I remove Control_L it would leave me with the key, which is
also good for me.

Can this be done?
Xmodmap maybe?

Thx, any tip is highly apprecaited

I believe that by "remove current mapping" he means to delete the entry that makes "\" toggle to windowed mode.