# Multiple display on windows

**URL:** https://discourse.paraview.org/t/multiple-display-on-windows/839
**Category:** ParaView Support
**Created:** [November 5, 2018, 10:58am UTC](https://discourse.paraview.org/t/multiple-display-on-windows/839 "2018-11-05T10:58:56Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Laurent\_Garnier](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/l/e99b99/32.png) [@Laurent\_Garnier](https://discourse.paraview.org/u/Laurent_Garnier)
#### Post date: [November 5, 2018, 10:58am UTC](https://discourse.paraview.org/t/multiple-display-on-windows/839/1 "2018-11-05T10:58:56Z")

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Hi,

I’m running windows 7, with MSMPI (1018), Paraview up to date recompiled with MSVC 2017

I try to run paraview on multiple display on windows but it failed on  
"Assertion failed: this-\>ParallelController-\>IsA(“vtkSocketController”) || this-\>ParallelController-\>IsA(“vtkCompositeMultiProcessController”)

Any idea ?  
I try first to run multple display on a single machine with :

> mpiexec -np 16 pvserver.exe -tdx=2 -tdy=3  
> And it failed on the previous error.

Other tests with :

> mpiexec -np 16 pvserver.exe local.pxv (with 2 display inside)  
> =\> give me only one window instead of 2

server-side \> mpiexec -np 16 pvserver.exe client.pxv (with 1 diplay on network client)  
client-side \> mpiexec -np 16 pvrenderserver.exe  
=\> Give me nothing

Any clue ?