AnyService Installer isn't really an Add-In as there is no installer for it, nor does it ever actually appear in the console. However, it is absolutely indispensable. If you've done much tinkering with Windows Home Server, running programs as a service is absolutely necessary. There are a number of tutorials on the Wiki that already use this wonderful utility. Though, this Add-In isn't for everyone and every program. Only programs that don't really require user interaction, or that have a web interface are suited for running as a service.

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