This is the command glxheads that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
glxheads - exercise multiple GLX connections
glxheads [display ...]
The glxheads program will try to open GLX connections on multiple X displays as specified
on the command-line. If a connection can be made it will try to create a direct GLX
context (and fallback to using indirect contexts if that fails) and open a window
displaying a spinning green triangle.
If no display names are specified, glxheads will default to opening a single local
connection on display 0.
To open a local connection on display 0 and two remote connections to the hosts mars
(display 0) and venus (display 1), run glxheads with the following command-line:
$ glxheads :0 mars:0 venus:1
Use glxheads online using onworks.net services