How do I force WhatsOpen to eject a device for me?

Whats open can attempt to force your device to eject if you click the force eject button in the toolbar after selecting the volume in the volumes popup button. What does force ejecting do?

Forcing eject sends all processes that have the device open a kill signal to make them close. This isn't the most gracefull way for programs to exit and should be used only if you are certain your data is saved.