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## Specifying a machine file

When using VisIt with MPICH on some clustered computers, it is necessary to specify a machine file, which is a file containing a list of the compute nodes where the VisIt compute engine should be executed. If you want to specify a machine file when you execute VisIt in parallel on a cluster that requires a machine file, click on the Default Machine File check box and type the name of the machine file that you want to associate with your host profile into the Default Machine File text field.