For machines using Windows XP, you can apply software restriction policies to prevent them from running the remote desktop connection (mstsc.exe). Your only real recourse for earlier versions of Windows is not to install the Remote Desktop Protocol (RDP) client. (XP clients can draw from the Unlimited pool for Win2k terminal servers, but new XP clients will need their own Terminal Server Client Access License (TSCAL) for Win2k3 terminal...
Server-side, you can stop people from launching rogue application servers that access the license server by using the License Server Security group policy (found in Windows ComponentsTerminal ServicesLicensing). This policy is available only to Win2k3 terminal servers.
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