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When teh Guest Editors originally proposed this special issue topic to the IEEE, it was targeted for the Personal Communications magazine. Since that original proposal, IEEE Pervasive Computing came into existence and Personal Communications was renamed IEEE Wireless Communications. The editorial boards decided to spread the special issue across both magazines. We received a total of 24 submissions, and 12 were accepted (seven in IEEE Pervasive Computing and five in the Oct. 2002 IEEE Wireless Communications). The Guest Editors provide a brief summary of the articles included in tis Special Issue.