When you take all the above and factor in the increasing speed, capacity and flexibility of computer technology, eventually it would be like carrying a little garage-door opener that you point at whatever computer is nearby.
* hmm, what about a PXE "network boot" that uses ordinary wireless-G, and discovers that the gadget in your pocket is a boot server?
P.S. - I am being a little bit neo-steampunk here by intentionally ignoring quite a few things that will probably supercede and obsolete the technologies I mention. Well, to be more precise,
so I'm postulating the existence of a literary subgenre set in an anachronistic alternate *future history*, in which things we believe will necessarily happen, don't. OK, wikipedia's article on steampunk mentions something similar and suggests the term retro-futurism.
Steampunk is a subgenre of speculative fiction, usually set in an anachronistic Victorian or quasi-Victorian alternate history setting. Fiction in the steampunk genre is set in the past, or a world resembling the past, in which modern technological paradigms occurred earlier in history, but were accomplished via the science already present in that time period. The genre typically falls into the realm of science fiction.