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URL param and its reference



I created a custom list button on Opportunity, and this list button is used in Contact - opportunity related list - to replace the New opportunity button.


The below url, i do not know what is 'lookupcmpgn' for and which object it refer to. Any ideas?{!Contact.Id}&accid={!Account.Id}&conid={!Contact.Id}&opp6={!Contact.LeadSource}