In an effort to get RemoteApp behaviour on my Mac OSX and Viliv S5 I looked into SeamlessRDP. After spending countless hours trying various configurations I’ve come to a conclusion. It works! but only with WinXP sp2 (sp3 unconfirmed). Vista and Win7 do not work. Server 2003 and Server 2008 of course will work provided you have the TS license. The source of the problem seems to be that the RDP host is ignoring the application execution request unless it was “server 2003 or above” or WinXP. Vista and Win7 appears to be hard coded to ignore regardless of my attempts to change the behaviour through group policies.