Here's my problem

 

I would like to send a message to all users of a site. If they are online it's not a problem as I can send to all online users with a global message using  PushSTCMessage, but I would also like for new users to get the same message when they logon.

 

Is there any method of sending a message to a group of users in messenger or chat?

 

I'm using ASP.NET 3.5

 

All ideas would be very welcome.