In looking into the use of Linux images in the VCL and using xRDP to allow Windows and Mac users to access the images in their usual way - RDP Client, I've come across two more RDP Client products, both Open Source.
CoRD http://cord.sourceforge.net/ for Macs. (I can't figure out what the acronym stands for!) FreeRDP http://www.freerdp.com/ which has free Android and iOS ports available. (It would be good to hear of any experiences with this, as more and more students have mobile devices.) --henry schaffer
