http://blog.didierstevens.com/2010/12/01/runasil/



The following command launches notepad.exe with a low integrity level, instructing notepad to open test.txt:



runasil.exe notepad.exe test.txt



To automatically launch notepad via runasil.exe, using "Image File Execution Options", create this registry key



HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\notepad.exe



and create a value debugger equal to "runasil.exe -d" (don t forget option -d).



You can also specify the integrity level via an option:



-l for low

-m for medium

-h for high

-s for system



By default, runasil launches the application with a low integrity level.



Don t forget you need at least Windows Vista to use integrity levels, and that a process can t create a new process with a higher integrity level than itself.