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How to add link in 3rd party application to open Specific opportunity in salesforce
In my application I associate opportunities with opportunities in sales force. I would like to add a link, when the user clicks on it, I open a browser window that goes to sales force and after the user enters credentials is forwarded to that Opp. page. I know this is possible, is there a certain format for the URL link? Is there a place where I can get information for these kind of tasks?

It will look like this:
https://na1.salesforce.com/[OpportunityID]
where the OpportunityID is the salesforce ID for that Opportunity and 'na1' might be replaced by some other server name. Just click on any Opportunity and look at the Browser Location.
Note that the describeSObject call includes the URL patterns for particular object types (including the correct server name)