Besides displaying all the devices connected to your computer, DevManView gives you a list of anything detected on the local network. However, you'll only be able to see this if you have administrator privileges.
An especially interesting feature lets you disable devices on your computer from a different Windows machine, allowing you to resolve problems arising from a hardware error.
DevManView is a very comprehensive tool and an excellent alternative to the Windows device manager. Also, its interface is so simple that anyone can start using it right away.