A touch pad module includes a touch pad unit for generating contact signals in response to operation thereof, a control circuit unit separate from the touch pad unit, and an electrical coupling unit having a first end coupled to the touch pad unit and a second end coupled to the control circuit unit. A smart card stores user information. In another embodiment, a new QoS_Request extension and a new QoS_Reply extension are defined for use in Mobile IP networks. In some implementations, the matrix code reader may determine that additional information or a confirmation to transmit the instructions is needed and may prompt a user for the additional information or confirmation.