General extended stored procedures (Transact-SQL)
Applies to: 
SQL Server
SQL Server supports the following system stored procedures that provide an interface from an instance of SQL Server to external programs, for various maintenance activities.
- xp_cmdshell
- xp_enumgroups
- xp_grantlogin
- xp_logevent
- xp_logininfo
- xp_msver
- xp_revokelogin
- xp_sprintf
- xp_sqlmaint
- xp_sscanf