Who is Using X11's LBX and RX Features?

tjansen asks: "In 1998 Open Group released X11R6.4, which introduced two nifty features called LBX (Low Bandwidth X) and RX (Remote Execution). LBX reduced the bandwidth needed by the X protocol, and RX made it possible to embed a remote X11 application securely into a Netscape plugin. Since version 4.0 both are also included in XFree86. Together they look like a nice and platform-independent solution for Application Service Providers (there are Windows clients, of course) and I wonder why I have never seen anybody using this."