What can user do with VIEW SERVER STATE permissions?

In SQL Server 2008 there is a permissions VIEW SERVER STATE. What rights this permission give to user? What SQL Server mean by SERVER STATE?

From serverfault hyty

• Read http://msdn.microsoft.com/en-us/library/ms188754.aspx

  Dynamic management views and functions return server state information that can be used to monitor the health of a server instance, diagnose problems, and tune performance.

  There are two types of dynamic management views and functions:

  - Server-scoped dynamic management views and functions. These require VIEW SERVER STATE permission on the server.
  - Database-scoped dynamic management views and functions. These require VIEW DATABASE STATE permission on the database.
  

  hyty : Ok, many thanks!
  From bindbn