Cross-server communication in load-balanced ASP.NET web application

[--_Joe_--]

My ASP.NET application stores some expensive (to load) data in an application-accessible \[code\]static\[/code\] field (using \[code\]System.Web.Caching.Cache\[/code\] is inappropriate in this case).My application is also load-balanced across a couple of webservers with a central SQL Server on another machine.There are times when this cache will be invalidated. If the user submits some updated data on \[code\]Server01\[/code\] then that application knows about it can will clear its local cache when it also submits the data to the database.However, how can \[code\]Server01\[/code\] notify \[code\]Server02\[/code\] of this change so \[code\]Server02\[/code\]'s cache will be invalidated?I'm not aware of any built-in inter-server IPC in ASP.NET for web-farm communication, it seems that I would have to create a URI handler in the application (e.g. \[code\]http://mysite/InvalidateCache\[/code\]) that would be called by the other server, but it seems a bit hackish. Is there a better way?