These are not secure machines. These are Personal Computers which can be breached by the user and even by me if you let me have access to the machine.
The answer must be yes.
Bob
Is it possible to breach a systems security by using a PCKS7 file which is also seen on a system as a p7b file extension?
Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic