i am not so brilliant at this parameter thingy. i have the same problem with summoning but what to do with the -DEVMODE.. how to get it working?
First provide a shortcut on your desktop.
Next, right click on the shortcut and select properties.
Do you see the "Target" in the window?
Go to the end of the name and add -DEVMODE. Just add at the end, do not edit anything else.