My dad was at his budys house they were looking for something and just bs,ing. my dad asked his frind if he could dowenload something and his frind said ok ill just leve the computer on and runing . my dad asked you just going to leave it on frind said yes then my dad said arnt you worry you get hacked leveing it on all night unintended. frind said no i have a hard ware fire wall imposiable to hack unlike software fire wall which can be hacked. is this true is there such a device a hard ware fire wall?