No there's no way to clear a users history, it's a security thing.
I'm sure you have good intentions, but could you imagine what the internet would be like if you could do that. Every website you'd go to would clear your history to keep you on their site, and you'd never be able to even use the Back button. You'd essentially be trapped in a site until you close your browser and start all over again.
Again, the only way to have no history in a browser window is to open a new one. - tleish