Datacolor User to User Support Group.

Can somebody definitively answer the following question. 

I am getting different answers from different people.

When projecting images through a projector onto the screen does the
projector need to be calibrated to the screen, or only the laptop
driving the projector?

For the record my intuition suggests the projector should be
calibrated to the screen for accurate colour, but colleagues tell me
calibration the laptop is sufficient.

Thanks

Roy Sletcher