You can impersonate a user through two mechanisms:
The impersonate authentication takes place during a user authentication. You can do it:
The example below is based on the saw url:
http://server:port/analytics/saw.dll?Dashboard
&NQUser=Login
&NQPassword=Password
&Impersonate=TheUserLoginToImpersonate
In 11g, the user who wants to impersonate another user must have the following application policies: