A hidden share is identified by a dollar sign ($) at the end of the share name. Hidden shares are not listed when you look through the shares on a computer or use the net view command. The versions of Windows that are listed in the "Applies to" section create hidden administrative shares that administrators, programs, and services can use to manage the computer environment on the network. By default, Windows can enable the following hidden administrative shares:
Root partitions or volumes
The system root folder
The FAX$ share
The IPC$ share
The PRINT$ share
Root partitions and volumes are shared as the drive letter name appended with the $ sign. For example, drive letters C and D are shared as C$ and D$.

The system root folder (%SYSTEMROOT%) is shared as ADMIN$. This is your Windows folder, and the administrative share provides administrators easy access to the system root folder hierarchy over the network.

The FAX$ share is used by fax clients to send a fax. This shared folder caches files and accesses cover pages that are stored on a file server.

The IPC$ share is used with temporary connections between clients and servers by using named pipes for communication among network programs. It is primarily used for to remotely administer network servers.

The PRINT$ share is used to remotely administer printers.