Abstract text

An extension unit includes a connection module, a processing module, a video graphics interface module, and a user interface module. The processing module is operable to: detect coupling of the handheld computing unit to the connection module; determine identity of the handheld computing unit; determine access privileges of the handheld computing unit based on the identity; negotiate access terms with the handheld computing unit based on access privileges of the handheld computing unit; monitor the signals for compliance with the access terms; and enable routing of a signal of the signals when the signal is compliant with the access terms. The video graphics interface module is operable to receive video graphics signals from the connection module, when enabled, and output the video graphics signals. The user interface module is operable to receive user input signals and output the user input signals to the connection module when enabled.