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Salesforce webservice callout

Hi Guys,


The senario is below. Please have a look and give me any idea. If that sounds impossilbe, other ways will be appreciated. Thanks


-- two Salesforce instances, one as server and the other as client

-- some apex class in server will be called using webservice technique by client apex controller + visualforce page(client app).


is it possible? How can I get client app login the Server first to get session Id. The app needs to get authorisation anyway.





Best Answer chosen by Admin (Salesforce Developers) 



this works well for login issue. by the way, the api version upgraded to 16.0