view of a locking system 100 according to a preferred embodiment of the present invention locking system 100 includes a portable electronic device 110 having a hinged member 120 that has an opened configuration as shown permitting access to the keys and other operational interface elements 130 of device 110 and a closed configuration not shown in which hinged member 120 overlies operational interface elements 130 to inhibit access device 110 has a side wall 140 that defines a security aperture 150 preferably security aperture conforms to kensington security standard locking system 100 includes an attachment system 160 having an attachment device 170 and a localizer 180 attachment system 160 has two configuration modes an engagement disengagement mode in which attachment device 170 may engage and disengage security aperture 150 and a lock mode in which attachment device 170 is attached to device 110 via engagement of security aperture 150 localizer 180 coupled to attachment device 170 localizes attachment system 160 an object obj that is something other than device 110 when attachment system 160 is in the lock mode and localizer 180 is localized to object obj device 110 is also localized to object obj attachment system 160 preferably includes a lock for example a tumbler combination or cable locking system having a mechanism for maintaining attachment system 160 in the lock mode as is explained later attachment device 170 preferably includes.