Administrative shares are hidden network shares created by Windows NT family of operating systems that allow system administrators to have remote access to every disk volume on a network-connected system. These shares may not be permanently deleted but may be disabled. Administrative shares cannot be accessed by users without administrative privileges. Windows XP and later further curtail the use of these shares.
Administrative shares are a collection of automatically shared resources including the following:
Disk volumes: Every disk volume on the system is shared as an administrative share. The name of these shares consists of the drive letters of shared volume plus a dollar sign ($). For example, a system that has volumes C, D and E has three administrative shares named C$, D$ or E$. (NetBIOS is not case sensitive.)
OS folder: The folder in which Windows is installed is shared as admin$
Fax cache: The folder in which faxed pages and cover pages are cached is shared as fax$
Co-sysops are users who may be granted certain admin privileges on a BBS. Generally, they help validate users and monitor discussion forums. Some serve as file clerks, reviewing, describing, and publishing newly uploaded files into appropriate download directories.
Historically, the term system operator applied to operators of any computer system, especially a mainframe computer. In general, a sysop is a person who oversees the operation of a server, typically in a large computer system. Usage of the term became popular in the late 1980s and 1990s, originally in reference to BBS operators. A person with equivalent functions on a network host or server is typically called a sysadmin, short for system administrator.