How do you determine if SQL notification services is installed?

Q: Question regarding SQL 2005 notification services..it states to use the following command prior to installing patch 931815, when I do net stop NS$instance_name (net stop NS$servername. I checked in SQL Server Studio Management, right clicked on
A: How to determine whether SQL Server 2005 Notification Services is installed

To determine whether SQL Server 2005 Notification Services is installed, locate the following registry entry in Registry Editor:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\90\NS\Setup\VersionIf the value is 9.00.1399.06, the original version of SQL Server 2005 Notification Services is installed.

If the value is 9.1.2047.00, SQL Server 2005 Notification Services SP1 is installed.