A computer system, comprising: a removable module comprising: a first processor; first and second applications running on the first processor using a first operating system platform; a first electronic component interacting with the first processor running the first application to provide a first operating feature when the module is being used in a stand-alone manner; and a battery supplying power to the first processor and the first electronic component; and a chassis removably receiving the module, the chassis comprising: a second processor; a display operatively coupled to the second processor; a keyboard operatively coupled to the second processor; a third application running on the second processor using a second operating system platform, the third application running on the second processor interacting with the first application running on the first processor when the module is received by the chassis; and a power supply (210, 214) providing electrical power to the second processor and display; wherein the first application running on the first processor using the first operating system platform is also runable on the second processor using the second operating system platform when the module is received by the chassis and wherein the second application is operable to provide a second operating feature when the module is being used in a stand-alone manner, the second application further operable to allow the chassis to provide the second operating feature when the module is received by the chassis. a removable module comprising: a first processor; first and second applications running on the first processor using a first operating system platform; a first electronic component interacting with the first processor running the first application to provide a first operating feature when the module is being used in a stand-alone manner; and a battery supplying power to the first processor and the first electronic component; and a first processor; first and second applications running on the first processor using a first operating system platform; a first electronic component interacting with the first processor running the first application to provide a first operating feature when the module is being used in a stand-alone manner; and a battery supplying power to the first processor and the first electronic component; and a chassis removably receiving the module, the chassis comprising: a second processor; a display operatively coupled to the second processor; a keyboard operatively coupled to the second processor; a third application running on the second processor using a second operating system platform, the third application running on the second processor interacting with the first application running on the first processor when the module is received by the chassis; and a power supply (210, 214) providing electrical power to the second processor and display; a second processor; a display operatively coupled to the second processor; a keyboard operatively coupled to the second processor; a third application running on the second processor using a second operating system platform, the third application running on the second processor interacting with the first application running on the first processor when the module is received by the chassis; and a power supply (210, 214) providing electrical power to the second processor and display; wherein the first application running on the first processor using the first operating system platform is also runable on the second processor using the second operating system platform when the module is received by the chassis and wherein the second application is operable to provide a second operating feature when the module is being used in a stand-alone manner, the second application further operable to allow the chassis to provide the second operating feature when the module is received by the chassis.