Are you referring to the ability to bypass a pre-boot authentication screen? If so, I'm not aware of any method of remotely logging into such a portal using vPro 5.x or less, since Serial-over-LAN only supports text-based "GUIs".
When the mahine starts up Pointsec is placed in the MBR and is involved in the boot up but as soon as it has started a GUI comes up which you can fill in your loginname and Pointsec password. This is what I have need of to doing remotly. Is that possible?