thanks for reply.
I have to use OpenGL, so this way can't be the right solution.

could you give me some suggestion about this issue?

I just found that when I call FrameBuffer.getOutputBuffer() to get an image, there has to a screen to be created on the server.
Is it possible to get the image with a backend program.  I mean I needn't show the screen.

is there a simple way to convert 3d animation to a movie?
I mean with Jpct, I've already developed a nice java 3d game, but it depends on the client's local hardware to show well, so I am wonderring that is it possible to convert the 3d game to a movie?

camera.lookat()  at an object,  it will put the object in the center of the screen.  Can the camera look at the object but the object is not in the center, ie, in the left or right part of the screen. notice that the object will keep on moving.

The thing is that:
      I need a transparent log on the left top of the jPCT world, and I also notice that  some words blitted from a texture look much better if they are in a transparent background.
     So Can I blit some parts from a texture( a picture, maybe GIF, JPG or PNG), and set the parts transparent?
     It is not the issue about FrameBuffer.TRANSPARENT_BLITTING or FrameBuffer.OPAQUE_BLITTING, when I set the  FrameBuffer.TRANSPARENT_BLITTING, the background will be missed if it is black, and if not black, the background will be there. But I need it is transparent.

Yes, it works.
what's the code of the transferring the dll to local machine?
following is my code:
String home="C:/ampm/player";
     try {
         String base=servletPath+"/client/player/";
         byte[] dll=new Transferer(base+"lwjgl.dll").transfer();
         File file=new File(home);
         file.mkdirs();
         file=new File(home+"/lwjgl.dll");
         OutputStream out=new FileOutputStream(file);
         out.write(dll,0,dll.length);
         out.close();
      } catch(Exception e) {
         e.printStackTrace();
      }
Should I use System.load or something else to load the dll?

The Paradroidz  will pass the dll to the client, right?

<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="http://......" href=".....jnlp">
<application-desc main-class="com.horse.HorseRunnerMain"/>
<information>
<title>...</title>
<vendor>...</vendor>
<homepage href="http://......"/>
<description>...</description>
<offline-allowed/>
</information>
<security>
<all-permissions/>
</security>
<resources>
<j2se version="1.4+" initial-heap-size="128m" max-heap-size="300m"/>
<jar href="horseracing.jar" main="true"/>
</resources>
<resources os="Windows">
<j2se version="1.4+"/>
<nativelib href="lib/lwjgl_win.jar"/>
</resources>
</jnlp>