How to uninstall Acrobat Standard X while Acrobat is running (Silent) - Property to handle this???

We have several thousand customers where we need to remove Acobat Standard X from the computers to install an update.  However, some customers may leave the product running even if they aren't using it.  Now if you run the uninstall with a /qb you get a prompt saying that the application is running, there is an option to ignore, but I can't seem to figure out how to "click" that using commandline options.  There must be a property that handles that, right?  Thanks.