A handheld computer is disclosed. A support member can be attached to the body for supporting the body on a user. The personal alarm device includes an antenna configured to detect a magnetic field, a controller electrically coupled to the antenna, and a warning device electrically coupled to the controller. If the channel does not intend to re-initiate the channel program, a first combination of bits in a re-initiate field of a status-acceptance packet are set which indicate that the channel will take no further action.