[racket] 'Capturing' the mouse / fix mouse position

Hi,

Is there a way to 'fix' the mouse position, e.g. put the cursor to a 
specific position programatically?
I could not quite make it out from the mouse-event documentation - guess 
they're just the receiving end of things.
I'd like to keep the cursor inside of a game window even during 'hectic' 
moments ;)

Thanks,
Philipp