Some reasons for modifying this value might include allowing a specific service to affect other computers in a network, in which case you would have to change from 'local system' to a user account with access permissions to that remote computer. This is a bit more complex than were looking for right now, so let's leave it at that.

The recovery tab allows you to specify certain actions if that service fails or is shutdown. Possible actions include restarting the service, rebooting the computer or running a specific program. Generally the only reason to touch these controls is when you've created your own service, but administrators may also want to set some options here for security (for example, rebooting the computer or running a system scan if a firewall or anti-virus service fails or is stopped). You get the idea.

Finally, the 'dependencies' tab simply lists the other services that this service needs to run. You should be aware of these dependencies if you plan to experiment with the services panel, as turning off a single essential service can have a disastrous domino effect on the other services, and the stability of your system.