The Z640 supports intel vPro remote management at the chipset level, which allows you access to the workstation even when the system is powered off
if you have multiple units to manage, there are enterprise tools available to help setting things up
you can also set it up individually, and even allow web access to each machine. pretty powerful stuff
When powered on, there are several tools available to use. HP developed RGS (Remote Graphics Software) as a no-cost tool to allow full 3d performance to be accessed remotely. www.hp.com/go/rgs (NOTE: disregard to 'how to buy' button - that is only for non HP Workstation products)