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1 SF login for two different instances?

Hello Everyone,


Our company has several seperate instances of salesforce.com. Is it possible to use a single sign on to gain access to each instance instead of having to create a login for each instance?


Any information would be much appreciated.





An organization on Salesforce.com is globally unique, and requires a globally unique username.  So user John Smith would need a login for jsmith@org1.com and jsmith@org2.com. 


I believe you can work around this with SSO and federation identifiers.  See here for details:

https://<your instance>.salesforce.com/help/doc/user_ed.jsp?section=help&target=sso_tips.htm&loc=help&hash=heading_2_1