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## Activating a host profile

Only one host profile can be active for any given computer. When VisIt launches a remote component, it looks for the active host profile for the computer where the component is to be launched. To activate a different host profile, click the Active profile for host toggle button in the Selected profile settings. The VCL and the database server use the active host profile but VisIt will prompt you for a host profile to use before launching a compute engine if you have more than one host profile or your only host profile has parallel options set for the compute engine.