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can Outbound Message work on Client-Side Application?

Hi all,
I'm developing a composite application on salesforce.com (do not use external server). all source code is packaged in swf file and upload into salesforce.com for S-Control use.
I have a custom object (it is Address), I want when user add/update an Account, it will automatically add/update data into Address, the data will be got from external application (using webservice API). As you know trigger can not call S-Control, someone suggest me to use workflow, I never use workflow before, It seem it need to work on server (not client).
Anyone expert in workflow or have any idea can resolve the above issue, please share me.
Many Thanks.