“Well , this is in concerned with MS-Server OS (ofcourse..=) … we have some nice definitions here…”
User rights allow users to perform tasks on a computer or a domain. User rights include logon rights and privileges. Logon rights control who is authorized to log on to a computer and how they can log on. Privileges control access to computer and domain resources, and can override permissions that have been set on specific objects.
An example of a logon right is the ability to log on to a computer locally. An example of a privilege is the ability to shut down the computer. Both types of user rights are assigned by administrators to individual users or groups as part of the security settings for the computer.
For a summary of the prescribed settings in this blog, see the Microsoft® article on “Windows Default Security and Services Configuration”.
Note: Internet Information Server (IIS) expects certain user rights to be assigned to the built-in accounts that it uses. The user rights assignment settings in this chapter identify which rights IIS requires; for more information about these requirements, see the “IIS and Built-In Accounts (IIS 6.0)” list at http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/3648346f-e4f5-474b-86c7-5a86e85fa1ff.mspx