A procedure send message to all active SQL Server users
(SQL Server Connections) on your Server.
I use Win command NET SEND.
Like the one posted before, the use of the SP is like this: proc_alerts 1,18. This will show the first 18 alerts on the system. OR proc_alerts 20,35 will show from 20 to 35. This lets you manage the list without letting go out of the screen.