Yes, but you need a Mini DisplayPort to VGA. However, does your monitor have DVI-D input? Not all P191w have DVI-D but if it does a Mini DP to single DVI-D would be cheaper. You definitely don't need one of the really expensive($100) Mini DP to dual DVI adapters.Mini DisplayPort to VGA Adapter $13.43 + shippingMini DisplayPort to DVI Adapter $6.46 + shipping
Monoprice has cables if you prefer an all in one cable but they aren't as portable.