sentences:  In addition to burglary, the covert means might include the installation of keystroke logging or trojan horse software or hardware installed on (or near to) target computers or ancillary devices.It is even possible to monitor the electromagnetic emissions of computer displays or keyboards from a distance of 20 metres (or more), and thereby decode what has been typed.This could be done by surveillance technicians, or via some form of bug concealed somewhere in the room.