"Guest" Hack

apparently, someone has created a hack that tricks the PC into thinking that any PC is the primary PC. I was thinking about this today and I was wondering how useful it really is. I've never had an issue moving content to the device from any PC in guest mode. Also, wouldn't you have to install it on someones PC? I'm pretty sure that I wouldn't want just anybody messing around with my rig. But, hey, to each his own.