Call this method to get the impersonation level from the access token.
bool GetImpersonationLevel( 
   SECURITY_IMPERSONATION_LEVEL* pImpersonationLevel 
) const throw(...);
Parameters
- pImpersonationLevel
Pointer to a SECURITY_IMPERSONATION_LEVEL enumeration type which will receive the impersonation level information. 
Return Value
Returns true on success, false on failure.
Requirements
Header: atlsecurity.h