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The web currently offers a large spectrum of interactive tools enabling the dissemination of health-related messages aimed at prevention. The REZO programme, developed by the community-based organization Action Séro Zéro (based in Montreal, Quebec), provides a good example of how the Internet can be used to promote healthcare and health promotion among sexually active male homosexuals in Quebec. A recent assessment of this program suggests that the organization appears to be meeting the challenge of adapting to an exponential increase of knowledge in the field of sexual health and health prevention as well as to rapid changes in communication technologies.