[Paraview] Problem with parallel module

[Gregory D Abram]

I'm trying to create a parallel reader and I guess I'm not understanding 
something.  Before going so far as to actually read data, I have a little 
attempt that, on each of 2 parallel servers, creates two orthogonal meshes 
in the output vtkUnstructuredMesh thats passed into its ExecuteData 
method.   It seems to run on both servers; I can put in a gdb breakpoint 
at the ExecuteData entry point, and it gets hit in both cases.   I can 
watch it create the two grids on each node.  I had guessed that the 
reader, on each of the servers, would pass the local data down through 
similar pipelines, which would join when truly parallel filters are 
encountered, and finally join in a IceT sort-last rendering process. 

Unfortunately, it seems that the output of the reader in the MyId = 1 
server is disappearing.  IceT is doing the rendering, I think - rendering 
windows pop up on the two server node's X servers.  But the one on the 
MyId = 1 server remains empty, while the other shows the mesh thats 
created on that server.

So I guess I'm wondering if I have to explicitly gather the data back onto 
the MyId = 0 server and let PV handle redistribution?   Can somebody point 
me at an illuminating document (I have the PV book on order).

Thanks, 
Greg
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