Is it possible to determine if an application has been started under Terminal Server.

I have looked at the OS() function but I get the impression that it does not tell me that the application is actually running under Terminal Server.
I see that OS(10) can return that 'Terminal service is installed' and OS(11) can return that 'The system is a server' but I need to know if the running application is running under TS.

Any suggestions are welcome.

Thanks in advance,

Ron Brahma