who called "exec prc_QueryNotifications"

Now I am using TFS2010 + SQL SERVER 2008 + Visual Studio 2010

Everything after the VS2010 connect TFS 2010, From Sql Profiler we could see that the "exec prc_QueryNotifications" will be called.

I have checked Mr google, but sorry he can not answer.

So any idea about it? who call the "exec prc_QueryNotifications" and how to stop the calling? thansk