The default instance of the SQL Server Database Engine.
SQL Server (instancename)
A named instance of the SQL Server Database Engine, where instancename is the name of the instance.
SQL Server Agent (MSSQLSERVER)
The default instance of SQL Server Agent. SQL Server Agent runs jobs, monitors SQL Server, fires alerts, and allows automation of some administrative tasks.
SQL Server Agent (instancename)
A named instance of SQL Server Agent, where instancename is the name of the instance. SQL Server Agent runs jobs, monitors SQL Server, fires alerts, and allows automation of some administrative tasks.
Analysis Services (MSSQLSERVER)
The default instance of Analysis Services.
Analysis Server (instancename)
A named instance of Analysis Services, where instancename is the name of the instance.
Reporting Services
The default instance of Microsoft Reporting Services.
Reporting Services (instancename)
A named instance of Reporting Services, where instancename is the name of the instance.