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How to trigger call external application?

Hi all,

I have a custom object, it is named Address. When user add a record for Contact, I want to get data from MapQuest application by using Mapquest API and add data into Address.
How to do it? As I know trigger can not call S-Control, anyone can help me.


The best way to handle this would probably be to flag the address as changed and next time the app is run have it do whatever it needs to do to the address and update the data.
The problem is how trigger call external webservice API? since data is updated into Address Object is got from external application not Apex.