Not via an adaptor or cable, but via a Distribution Amplifier - 1 input, multiple outputs. You would only get the same image on both though - you wouldn't be able to set up a wide desktop or multiple monitors. To have different images on both you would have to have multiple graphics cards/outputs, very unusual on a laptop, but not unheard of on PCs.
A few examples here - but most online PC stores will have them (Ebuyer and the like);
http://www.extron.co....ytype.aspx?subtype=32