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Headless Mode allows you to do certain tasks without launching the GA user interface.
You can automate tracing a target device, or export assets from an existing trace.
You can also use Headless Mode to trace a target device using just the target-side components.
The main difference between using the host and target-side Headless Modes is where the trace output is stored.
The host Headless Mode can only save traces to the host machine, and the target Headless Mode can only save traces onto the target device.
The interfaces for each Headless Mode are also slightly different.
For more information, check the section Target-side headless mode
Be aware that exporting assets from an existing trace file can only be performed on the host.