In Windows Vista Business, I have the "Local Security Policy" opened up and I'm looking at the different "rights" that are assigned to groups. I see two groups that I did not create and are not default groups in Windows. The two groups I'm talking about are: LOCAL SERVICE and NETWORK SERVICE
These two groups don't show up in Computer Management under "local users and groups. What are they and what are they used for?
EDIT: furthermore, when modifying "permissions" I notice the "everyone" group and the "system" group. I don't see these two groups in the "local users and groups" folder, either. How am I suppose to add "users" to those groups if they don't show up in "local users and groups"?