An access control list (ACL) is a table that tells a computer operating
system which access rights each user has to a particular system object,
such as a file directory or individual file. Each object has a security
attribute that identifies its access control list. The list has an entry
for each system user with access privileges. The most common privileges
include the ability to read a file (or all the files in a directory), to
write to the file or files, and to execute the file (if it is an executable
file, or program). Microsoft Windows NT/2000, Novell's NetWare, Digital's
OpenVMS, and Unix-based systems are among the operating systems that use
access control lists. The list is implemented differently by each operating
system.
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