(case InSeNsItIvE):

Close all instances of Media Center Master:
/exit | /close | /quit

Launch Media Center Master only if it's not already running. If it is, show the Media Center Master interface.
/single

Tell an existing instance of Media Center Master to process new episodes and movie downloads immediately (If MCM is not running, this will simply start MCM and processing will occur after the library is loaded as usual):
/process

These command-line parameters can be used in conjunction with existing parameters, such as:
MediaCenterMaster.exe /t /single

This example will launch MCM minimized only if it is not already running. If it is already running, nothing will happen (no window activation since /t is specified).