NX compression library The Xcomp library and nxproxy, a stand alone program wrapping the functionalities built into the library, are the basic components you need to compress the X protocol produced by any standard X client. In its simplest configuration, a session is run on a remote server by having a NX proxy listening to X traffic and compressing such traffic across a TCP/IP connection to a proxy peer running on the local client. X traffic is decompressed by the local proxy and forwarded to the X server. The NX proxy makes use of "virtual display": the UNIX domain socket or the TCP port acting as a display on the application server, where the X11 protocol connection will be accepted and forwarded to the nxproxy peer running close to the X server. Besides compression of X protocol, nxproxy is able to tunnel SMB and multimedia channels, so it is possible to listen to music from the remote terminal server or make available local resources of the thin client to the remote session. nxproxy is able to compress X traffic with ratios ranging from 10:1 to 1000:1 and more. The way Xcomp/nxproxy achieves these results is through extensive caching and differential compression of X protocol requests and replies. Differential compression means that any X protocol message is analyzed to find a similar message encoded in the past. If similarities are found, only the differences are s