XGL is a high level graphic library available on SUN workstations. XGL access SUN graphic hardware.
XGL also supports X11 terminals. This driver may be used if XGL does not find an accelerated hardware, but if there is no specialized graphics card, performance is not as good as when the GPHIGS X11 driver is used directly. It is not, therefore, advisable to use this driver if there is no graphics card.
In such a case, GPHIGS will print the following message
GPHIGS cannot access an accelerated frame buffer