Abstract: A canister delivery system includes a vacuum unit. The vacuum unit includes a tube, a canister receiving cylinder and a canister that is slidably positioned within the tube. The vacuum unit selectively urges the canister in the tube. Thus, the canister is selectively delivered into and drawn out of the canister receiving cylinder. The canister is selectively removed from the canister receiving cylinder. The tube is vertically oriented in a vehicle drive through and the canister receiving cylinder is aligned with a vehicle. An extension unit is coupled to the tube. The extension unit selectively extends the canister receiving cylinder outwardly from the tube when the canister is delivered into the canister receiving cylinder. Thus, the extension unit positions the canister receiving cylinder within reach of the vehicle.

Abstract: A computer security system which prevents an unauthorized user from accessing the computer system when an authorized user has already logged onto the computer system and has temporarily left the workstation. The computer security system generally includes a sensor which is configured to detect the presence of a person in the region around a workstation and a processing unit which logs out of the computer when a person is no longer present in the region. An optional calibration tool may be provided to set the sensitivity of the sensor and prevent accidental logging out when the authorized user is still present in the region around the workstation.