Kill new processes

I'm in the process of making a security application (like kiosk software)
and I need to prevent other applications (processes) from running whilst
mine is. (or kill them as soon as they run)

I'm guessing I will need to enumerate all process that were running when my
application starts up and kill any new ones as they are detected, can anyone
give me any code examples on how to achieve this?

Any help is greatly appreciated!

Neil