ing applications, because those applications offer solutions to most of the challenges that users encounter. Consider the typical business user. As long as they are in their home office environment, wired con- nectivity is perfectly acceptable for both voice and data. When they leave the office and get in the car, mobile telephony becomes important. Mobile data has no application (thankfully!) in the car other than for those applications optimized for that environment-OnStar service, for example, or GPS-based guidance systems, or specific applications related to public safety. If, however, the user stops at Starbucks for cof- fee before going home and decides to check e-mail one last time, ubiq- uitous connectivity, whether wired or wireless, provides value to the user from a data perspective, while mobile telephony remains valuable for voice. An RJ-45 connection on the tabletop is just as serviceable as a Wi-Fi connection, not to mention far more secure and predictable. The bottom line is this. Mobility defines the characteristics of a lifestyle choice that involves networking, whether personal or work- related, while ubiquity defines the characteristics of the technology infra- structure required to support the mobile lifestyle. "Anywhere, anytime connectivity" has become the mantra of the mobile user, and while wire- Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Access Technologies Access Technologies less (Wi-Fi) is the most loudly proclaimed option, it is not the only option. This, I believe, is part of the reason that revenues associated with Wi-Fi remain elusive. It is sexy, cool, and functional. But of those three charac- teristics the only one that has revenue potentially associated with it is functional, and there are too many alternatives to wireless that offer lower cost, greater security, and more predictable connections. Unti