Flash Media Interactive Server and Flash Media Development Server support two-way, asynchronous, remote method invocation. Clients can invoke methods defined on the server, and the server can invoke methods on clients connected to the server. In client-side script, call the NetConnection.call() method to invoke a method defined on a server-side Client object. In a server-side script, call the Client.call() method to invoke a method defined on the client-side NetConnection object. You can also call NetConnection.call() in a server-side script to invoke a method on a remote server.

For more information, see Server-Side ActionScript Language Reference for Adobe Flash Media Server, ActionScript 2.0 Language Reference, and ActionScript 3.0 Language and Components Reference.