Abstract: A server includes a key generator and an authenticator. The key generator is configured to receive a request for a first key from a worker device, to create the first key that is associated with a worker, and to transmit the first key to the worker device. The authenticator is in communication with the key generator, the authenticator is configured to receive a second key and identification details from a customer device, to transmit the identification details to the worker device, to receive acknowledgment of the identification details from the worker device, and to authenticate the second key and the identification details with the customer device.

Abstract: A server includes a key generator and an authenticator. The key generator is configured to receive a request for a first key from a worker device, to create the first key that is associated with a worker, and to transmit the first key to the worker device. The authenticator is in communication with the key generator, the authenticator is configured to receive a second key and identification details from a customer device, to transmit the identification details to the worker device, to receive acknowledgment of the identification details from the worker device, and to authenticate the second key and the identification details with the customer device.

Abstract: A server includes a key generator and an authenticator. The key generator is configured to receive a request for a first key from a worker device, to create the first key that is associated with a worker, and to transmit the first key to the worker device. The authenticator is in communication with the key generator, the authenticator is configured to receive a second key and identification details from a customer device, to transmit the identification details to the worker device, to receive acknowledgment of the identification details from the worker device, and to authenticate the second key and the identification details with the customer device.

Abstract: A server includes a key generator and an authenticator. The key generator is configured to receive a request for a first key from a worker device, to create the first key that is associated with a worker, and to transmit the first key to the worker device. The authenticator is in communication with the key generator, the authenticator is configured to receive a second key and identification details from a customer device, to transmit the identification details to the worker device, to receive acknowledgment of the identification details from the worker device, and to authenticate the second key and the identification details with the customer device.

Abstract: A server includes a key generator and an authenticator. The key generator is configured to receive a request for a first key from a worker device, to create the first key that is associated with a worker, and to transmit the first key to the worker device. The authenticator is in communication with the key generator, the authenticator is configured to receive a second key and identification details from a customer device, to transmit the identification details to the worker device, to receive acknowledgment of the identification details from the worker device, and to authenticate the second key and the identification details with the customer device.

Abstract: A server includes a key generator and an authenticator. The key generator is configured to receive a request for a first key from a worker device, to create the first key that is associated with a worker, and to transmit the first key to the worker device. The authenticator is in communication with the key generator, the authenticator is configured to receive a second key and identification details from a customer device, to transmit the identification details to the worker device, to receive acknowledgment of the identification details from the worker device, and to authenticate the second key and the identification details with the customer device.

Abstract: A server includes a key generator and an authenticator. The key generator is configured to receive a request for a first key from a worker device, to create the first key that is associated with a worker, and to transmit the first key to the worker device. The authenticator is in communication with the key generator, the authenticator is configured to receive a second key and identification details from a customer device, to transmit the identification details to the worker device, to receive acknowledgment of the identification details from the worker device, and to authenticate the second key and the identification details with the customer device.

Abstract: A server includes a key generator and an authenticator. The key generator is configured to receive a request for a first key from a worker device, to create the first key that is associated with a worker, and to transmit the first key to the worker device. The authenticator is in communication with the key generator, the authenticator is configured to receive a second key and identification details from a customer device, to transmit the identification details to the worker device, to receive acknowledgment of the identification details from the worker device, and to authenticate the second key and the identification details with the customer device.

Abstract: Apparatus and methods for specifying contexts for machine-executable instructions. Modern graphical user interface systems employ the callback programming style. In this style, a system event handler responds to an event by executing application-level callback code and providing event information concerning the event as part of the context of the execution. The technique disclosed herein uses callback information names to specify the relationship between the event information and the execution context. The callback information names are defined globally, but represent the event information for a single execution of the callback code. Using the callback information names, it is possible to define the callback code in the function which adds the callback code to the graphical user interface system.