Is there a way to run JOGL on a headless system (ie one without a Video Card)?

In particular, when using offscreen buffers such as pBuffers, can I use them without having a video card available or are the pBuffer and/or JOGL calculations occurring on the video card?

Obviously I tried this (on a blade system) and it does not work, but is it because I will always need a video card for pBuffers and/or JOGL or is it because I didn't set some flag that would allow me to run on such a system - ie a flag that would make pBuffers and/or JOGL work through the CPU instead of video card?

thanks.