The program "SRVANY" from the "NT Resource Kit" allows a program to run as a service.

From: Paul Joslin (Paul.Joslin@sdrc.com)
 Subject: Re: Perl as an NT Service 
 Newsgroups: comp.os.ms-windows.nt.admin.misc, comp.os.ms-windows.nt
 Date: 1999/07/14

From the FAQ:

> How do I run a Perl script as a Windows NT Service?
> 
> You can run your Perl scripts as Windows NT Services via a program c
+alled srvany.exe, which comes with the
> Windows NT Resource Kit. Once srvany.exe is installed, read the srva
+ny.wri file which should be with it. This
> document will explain how to set up registry entries for your new se
+rvice. 
> 
> After you are set up, to run your script as a service do: 
> 
>         x:>srvany perl script.pl
>
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