Computerized access control devices, namely-- electronic lock boxes that contain a secure compartment which holds an access key for opening a door of a building,which are controlled by a local computer that authorizes access to the secure compartment, and that communicate with portable computers which contain secure access data in computer memory; Computerized security devices, namely-- electronic lock devices that are controlled by a local computer that authorizes access to a secure compartment within the lock device, and that communicate with portable computers which contain secure access data in computer memory; Security access control systems, namely-- a central computer and a secure access data storage computer server at a central location that exchange data over communication links to remote security control devices, namely-- portable computers which contain secure access data in computer memory, or with electronic lock devices that contain a secure compartment, in which the communication links consist of telephone lines, cell phones, or radios; Providing secure access control services, namely-- storing, at a central computer, secure access data for multiple users and for multiple remote sites; Maintaining a database of authorized users at a central computer; Retrieving secure access data from remote sites, by allowing authorized users to communicate with a central computer that has stored the secure access data; Compiling and disseminating, at a central computer, access log activity information of remote sites by use of a communication link to the remote sites