I read from somewhere that when ram is low QNX will kill some apps.
I found that is useful to kill a freezing android player.
The question is how to make ram low.
The pb web browser is ram intensive, just find a webpage full of flash or ad or javascript will do the trick.
My solution is do a Google search of "xda hd2", then choose the "android development " link. Any other apps will be force closed within seconds, including the android player.