Silent uninstall

I see that there is a silent install for the Mark program, but I need a silent uninstall. Is there a command? I have 50+ systems in a student lab I need to remove 7.1 and put 8 on. It would be helpful to have a silent uninstall command line option to work with my software management system. If it doesn't have a silent uninstall command, I'd suggest moving your installer tool to something like the free one here:
http://www.jrsoftware.org/isinfo.php (Inno Setup)
Thanks,
Wes
http://www.jrsoftware.org/isinfo.php (Inno Setup)
Thanks,
Wes