Lync sharing data

I have some problem when sharing desktop with MS Lync 2010 at my application side. My application use rfx for encoding sharing data, then send data to MS Lync 2010 side, but MS Lync only display a black rectangle and send mouse and keyboard event to my application(MS Lync can remote mouse pointer and typing at my app side).

MS Lync 2010 can decode rfx encode data? If not, can i find the data format use in MS Lync 2010 client side?

Thanks in advance.