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SFDC TechSFDC Tech 

Single Sign on

What is single sign on in salesforce and how is it used? what are the benefits of single sign on?
mjohnson-TICmjohnson-TIC
Single sign on is basically allowing one set of credentials to be used to access multiple authenticated sites.

In Salesforce, this is most commonly integrated with Active Directory. When configured, users can authenticate to Salesforce using their Active Directory credentials.

Here is an example https://developer.salesforce.com/page/Single_Sign-On_with_Force.com_and_Microsoft_Active_Directory_Federation_Services. 
SFDC TechSFDC Tech
is this easy to configure for any type of external application?
can this only be enabled by submitting a request to salesforce?
and once its enabled would it cause any impact to existing settings or configurations?