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## Setting the machine file

Some compute environments use machine files, text files that contain the names of the nodes to use for executing a parallel job, when running a parallel job. If you are running VisIt in such an environment, the Engine option window provides a text field called Machine file. The Machine file text field allows you to enter the name of a new machine file if you want to override which machine file is used for the selected host profile. The Machine file text field is only enabled when the Default Machine File check box is enabled in the Host profile Window's parallel options.