AppToService is a Windows NT/2000/XP/2003 Unicode console application that lets you run regular applications and servers as Windows services.
This allows you to have some of the benefits of a Windows service, such as the ability to run an application even when no user is logged on the computer, the ability to run an application under a specified user account, the ability to allow an application to survive logoff/logon sequences, hence saving the overhead of restarting it for each new user, and so on.
For instance, you can run a dialer application as a service to automatically connect a computer to the Internet following unattended reboots.