The DocKtor is often asked how to add a third, fourth, or more external monitors. This can be done with a dock plugged into a dock, and while this is possible, it not economical or technically friendly. Instead, consider the Targus ACA039 and/or ACA038 as needed. Both of these adapters utilize the same DisplayLink software already on the PC/MacBook so there are no additional software needed. Beware however, that in example cheap MCT based adapters are not compatible.