Uninstalling GroupWise messenger using command line

I need to uninstall GroupWise Messenger on more than 20 workstations. I would like to do the uninstall using
a command line that can deployed via Zenworks or script.

I know that you can run "setup.exe uninstall" to uninstall the program but it prompts for confirmation
to uninstall. Is there a way to bypass the confirmation message?