Abstract: A computing device comprises a plurality of user interface elements, a first communications link software module, and a removable processing unit comprising at least a processor module, a data storage module, and a second communications link software module. According to the embodiment, the first communications link software module and the second communications link software module are adapted to exchange digital information between the user interface elements and the removable processing unit, and when the first and second communications link software modules are exchanging digital information, user actions taken via the plurality of user interface elements are carried out by software operating on the removable processing unit.

Abstract: A system for electronic messaging, comprising a first device adapted to send and receive electronic messages using a short message service protocol of a wireless communications network and a plurality of second devices adapted to send and receive electronic messages using a short message service protocol of a wireless communications network, wherein the first device assembles an electronic message to send to a plurality of second devices at least in part by inserting a destination address into a user data header information element of the electronic message for each of said plurality of said second devices to which the electronic message is to be sent, is disclosed.