Is this host a terminal server?

Dear MS experts,

I am refurbishing a program that used to depend on a registry key /TSAppCompat to answer question "Is this host a terminal server?"  I am not seeing this key in Windows 7 and Server 2008 and would like your advice on best easy ways to answer this question using only "reg query" or other simple command-line mechanism.  If it still works in 2 years, that's even better.

Thanks!
-dave