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A handheld computer is provided that includes a first module combined with one or more modules. The first module includes a housing having one or more coupling surfaces, with each coupling surface including a coupling mechanism. A second module is coupleable to the first module. The second module in

A handheld computer is provided that includes a first module combined with one or more modules. The first module includes a housing having one or more coupling surfaces, with each coupling surface including a coupling mechanism. A second module is coupleable to the first module. The second module includes a third coupling surface having a second coupling mechanism for mating with the first coupling mechanism. The third coupling surface is positioned on the second module so as to abut at least partially against the second coupling surface when the first coupling mechanism is mated with the second coupling mechanism.

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A handheld computer is provided that includes a first module combined with one or more modules. The first module includes a housing having one or more coupling surfaces, with each coupling surface including a coupling mechanism. A second module is coupleable to the first module. The second module in

A handheld computer is provided that includes a first module combined with one or more modules. The first module includes a housing having one or more coupling surfaces, with each coupling surface including a coupling mechanism. A second module is coupleable to the first module. The second module includes a third coupling surface having a second coupling mechanism for mating with the first coupling mechanism. The third coupling surface is positioned on the second module so as to abut at least partially against the second coupling surface when the first coupling mechanism is mated with the second coupling mechanism. ing thicknesses between 0.002 and 0.010 inches. 9. The surge arrester of claim 1, wherein the stack of components further comprises a pair of conductive end terminals, with a first terminal being mechanically bonded to an end face of a component at a first end of the stack and a second terminal being mechanically bonded to an end face of a component at a second end of the stack. 10. The surge arrester of claim 1, wherein the stack of components comprises at least two varistors formed from ceramic material and mechanical bonding between end faces of two adjacent varistors is provided by stacking the varistors and heating them together such that the mechanical bond is formed by interaction between the adjacent ceramic end faces. 11. The surge arrester of claim 10, wherein the varistors are unfired before they are stacked and heated together. 12. The surge arrester of claim 10, wherein the varistors are partially fired before they are stacked and heated together. 13. The surge arrester of claim 10, wherein the varistors are fully fired before they are stacked and heated together. 14. The surge arrester of claim 10, wherein mechanical bonding between end faces of two adjacent varistors is provided by covering a varistor end face with a bond promoting material prior to heating the varistors together, the bond promoting material helping to produce a strong, electrically-conductive bond between the varistors. 15. The surge arrester of claim 14, wherein the bond promoting material comprises a slurry of the ceramic material. 16. The surge arrester of claim 1, wherein the stack of components comprises at least two varistors formed from ceramic material and mechanical bonding between end faces of two adjacent varistors is provided by placing a bonding agent between ceramic end faces of the adjacent components. 17. The surge arrester of claim 16, wherein the bonding agent comprises an organic adhesive. 18. The surge arrester of claim 16, wherein the bonding agent comprises an inorganic adhesive. 19. The surge arrester of claim 16, wherein the bonding agent comprises a metal-filled glass frit. 20. The surge arrester of claim 16, wherein the bonding agent comprises a solder or a brazing material. 21. The surge arrester of claim 1, wherein the at least one varistor is formed from ceramic material and mechanical bonding between an end face of the varistor and an adjacent component is provided by applying a metal layer to the end face and attaching the metal layer to a metal surface of the adjacent component. 22. The surge arrester of claim 21, wherein the metal layer and the metal surface are attached by soldering or brazing. 23. The surge arrester of claim 21, wherein the metal layer and the metal surface are attached using a solder or brazing material having a melting temperature less than 50° C. more than an expected operating temperature of the surge arrester. 24. The surge arrester of claim 21, wherein the metal layer and the metal surface are attached by: stacking the varistor and the adjacent component with a preform element between the metal layer of the varistor and the metal surface of the adjacent component; applying pressure to the varistor and the adjacent component; heating the varistor, the adjacent component, and the preform element to melt the preform element; cooling the varistor and the adjacent component; and removing the applied pressure. 25. The surge arrester of claim 24, wherein the preform element is formed from a solder composition. 26. The surge arrester of claim 21, wherein the metal layer and the metal surface are attached by: coating at least one of the metal layer and the metal surface with an epoxy; stacking the varistor and the adjacent component with the epoxy between the metal layer and the metal surface; applying pressure to the varistor and the adjacent component; heating the varistor and the adjacent component to cure the epoxy; cooling the varistor and the adjacent component; and removi