Thank you for the response, but no. The user logged in is Userx. The stored procedure executes as UserX. Not exactly the same situation

I can create this...

User is in both databases.

DECLARE @SN NVARCHAR(128);

EXEC master.dbo.xp_regread

'HKEY_LOCAL_MACHINE',

'SYSTEM\CurrentControlSet\services\MSSQLServer',

'ObjectName',

@SN OUTPUT;

SELECT @SN;