[h323plus] H.239 function problem

Hi, Did anyone ever use the h323plus and the simple program in h323plus website to use H.239 function ? I want to share the data content like remote desktop or powerpoint to remote client. I use the simple program to create the extend video session but no work. My running environment is ubuntu Linux 9.04, with ptlib 2.6.1 and h323plus from cvs.

Any advice to give to test h.239 ?

Thanks & Regards, Hans