Administrator Single Signon for Servers.

I am looking for an application that will allow our system administrators to use their own credentials to log on to a server ? but the user ID that is passed to the server for logging on is generic such as administrator. The system administrator will not know the administrator password; only their user ID and password. The software will log all logons and access for auditing purposes. The software will allow access via the console or RDP using the /f command.
If anyone knows of a solution, I would be most grateful.

Thanks. Spin.s