You can (un-)register XAMPP components as services in the control panel. right left besides the component name is a svc-checkfield. If checked, the control panel register that component as windows service so that it will get started with your windows start.
XAMPP is just a bundle of (loose coupled) common webserver applications. The control panel is just a central entry point. You can start/stop, use, register as service each component without the cp if you want to.
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