Example: "%ProgramFiles%\Windows Defender\MSASCui.exe" -Hide -CheckForUpdates

-Hide -> hide Windows Defender window
-UpdateAndQuickScan -> Check for Updates + launch Quick Scan
-CheckForUpdates -> Check for Updates
-FullScan -> Full System Scan
-QuickScan -> Quick Scan
-ScanResults -> Scan Results window
-Settings -> Options panel
-ShowSWE -> Software Explorer
-ShowSWE:Startup -> Software Explorer @ Startup programs
-ShowSWE:Running -> Software Explorer @ Currently running programs
-ShowSWE:Network -> Software Explorer @ Network-connected programs

source- http://windows-vista-tips-and-tricks.blogspot.com/