Macbook Air charger for Macbook Pro Retina?

The Air charger is 45W and the Pro Retina charger is 85W.  I understand that the Pro charger can be used for the Air and forums have said that the Air charger does not provide enough wattage for the Pro.  My question is will the Air charger fully charge the Pro if the Pro is not being used while it is plugged in?  And will the Air charger overheat or burn out per se if used for the Pro while the Pro is being used.

It will charge the Retina (if the retina is off) but slowly, and it will run hot, make sure that it has decent airflow.

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